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RL78/G15 CHAPTER 13 SERIAL INTERFACE IICA

R01UH0959EJ0110 Rev.1.10 Page 532 of 765

Mar 7, 2023

13.5.1 Start condition

A start condition is generated when the SDAA0 pin changes from the high to the low level while the SCLA0 pin is at the

high level. A start condition is a signal that the master generates to the slave when starting a serial transfer. When the

device is used as a slave, a start condition can be detected.

Figure 13-14. Start Condition

SCLA

SDAA0

A start condition is output when bit 1 (STT0) of IICA control register 00 (IICCTL00) is set (1) after a stop condition has

been detected (SPD0: Bit 0 of IICA status register 0 (IICS0) = 1). When a start condition is detected, bit 1 (STD0) of the

IICS0 register is set (1).

default chapter7
- Table of Contents7
Chapter 1 Outline19
- Features19
- List of Part Numbers22
- Pin Configuration (Top View)24
- 8-Pin Products24
- 10-Pin Products25
- 16-Pin Products26
- 20-Pin Products29
- Pin Identification31
- Block Diagram32
- 8-Pin Products32
- 10-Pin Products33
- 16-Pin Products34
- 20-Pin Products35
- Outline of Functions36
Chapter 2 Pin Functions38
- Port Function38
- 8-Pin Products38
- 10-Pin Products39
- 16-Pin Products40
- 20-Pin Products41
- Functions Other than Port Pins43
- Functions for each Product43
- Pins for each Product (Pins Other than Port Pins)44
- Connection of Unused Pins45
- Block Diagrams of Pins46
Chapter 3 Cpu Architecture55
- Overview55
- Memory Space56
- Internal Program Memory Space59
- Mirror Area62
- Internal Data Memory Space63
- Special Function Register (SFR) Area63
- Extended Special Function Register (2Nd SFR: 2Nd Special Function Register) Area63
- Data Memory Addressing64
- Processor Registers65
- Control Registers65
- General-Purpose Registers68
- And CS Registers69
- Special Function Registers (Sfrs)70
- Extended Special Function Registers (2Nd Sfrs: 2Nd Special Function Registers)73
- Instruction Address Addressing78
- Relative Addressing78
- Immediate Addressing79
- Register Indirect Addressing80
- Addressing for Processing Data Addresses81
- Implied Addressing81
- Register Addressing82
- Direct Addressing83
- Short Direct Addressing84
- SFR Addressing85
- Register Indirect Addressing86
- Based Addressing87
- Based Indexed Addressing91
- Stack Addressing92
- Illegal Memory Access Detection Function95
Chapter 4 Port Functions97
- Port Functions97
- Port Configuration97
- Port 098
- Port 298
- Port 498
- Port 1299
- Port13100
- Registers Controlling Port Function100
- Port Mode Registers 0, 2, 4, 12 (PM0, PM2, PM4, PM12)103
- Port Registers 0, 2, 4, 12, 13 (P0, P2, P4, P12, P13)105
- Pull-Up Resistor Option Registers 0, 2, 4, 12 (PU0, PU2, PU4, PU12)107
- Port Input Mode Registers 0, 2, 4 (POM0, POM2, POM4)109
- Port Mode Control Registers 0, 2 (PMC0, PMC2)110
- Peripheral I/O Redirection Registers 0 to 3 (PIOR0 to PIOR3)111
- Port Function Operations115
- Writing to I/O Port115
- Reading from I/O Port115
- Operations on I/O Port115
- Register Settings When Using Alternate Function116
- Basic Concept When Using Alternate Function116
- Register Settings for Alternate Function Whose Output Function Is Not Used117
- Register Setting Examples for Used Port and Alternate Functions118
- Cautions When Using Port Function127
- Cautions on 1-Bit Manipulation Instruction for Port Register N (Pn)127
- Notes on Specifying the Pin Settings128
Chapter 5 Clock Generator129
- Functions of Clock Generator129
- Configuration of Clock Generator131
- Registers Controlling Clock Generator133
- Clock Operation Mode Control Register (CMC)134
- System Clock Control Register (CKC)135
- Clock Operation Status Control Register (CSC)136
- Oscillation Stabilization Time Counter Status Register (OSTC)138
- Oscillation Stabilization Time Select Register (OSTS)140
- Peripheral Enable Register 0 (PER0)142
- Operation Speed Mode Control Register (OSMC)144
- High-Speed On-Chip Oscillator Frequency Select Register (HOCODIV)145
- High-Speed On-Chip Oscillator Trimming Register (HIOTRM)146
- System Clock Oscillator147
- X1 Oscillator (16-Pin and 20-Pin Products Only)147
- High-Speed On-Chip Oscillator150
- Low-Speed On-Chip Oscillator150
- Clock Generator Operation150
- Controlling Clock152
- Example of Setting High-Speed On-Chip Oscillator152
- Example of Setting X1 Oscillation Clock153
- CPU Clock Status Transition Diagram154
- Condition before Changing CPU Clock and Processing after Changing CPU Clock157
- Time Required for Switchover of CPU Clock and Main System Clock158
- Conditions before Clock Oscillation Is Stopped158
- Resonator and Oscillator Constants159
Chapter 6 Timer Array Unit160
- Functions of Timer Array Unit162
- Independent Channel Operation Function162
- Simultaneous Channel Operation Function165
- 8-Bit Timer Operation Function (Channels 1 and 3 Only)167
- Configuration of Timer Array Unit168
- Timer Count Register Mn (Tcrmn)173
- Timer Data Register Mn (Tdrmn)175
- Registers Controlling Timer Array Unit177
- Peripheral Enable Register 0 (PER0)178
- Timer Clock Select Register M (Tpsm)179
- Timer Mode Register Mn (Tmrmn)183
- Timer Status Register Mn (Tsrmn)189
- Timer Channel Enable Status Register M (Tem)190
- Timer Channel Start Register M (Tsm)191
- Timer Channel Stop Register M (Ttm)193
- Timer Output Enable Register M (Toem)194
- Timer Output Register M (Tom)195
- Timer Output Level Register M (Tolm)196
- Timer Output Mode Register M (Tomm)197
- Input Switch Control Register (ISC)198
- Noise Filter Enable Registers 1 (NFEN1)199
- Registers Controlling Port Functions of Pins to be Used for Timer I/O201
- Basic Rules of Timer Array Unit202
- Basic Rules of Simultaneous Channel Operation Function202
- Basic Rules of 8-Bit Timer Operation Function (Channels 1 and 3 Only)204
- Operation of Counter205
- Count Clock (F TCLK )205
- Start Timing of Counter207
- Operation of Counter208
- Channel Output (Tomn Pin) Control213
- Tomn Pin Output Circuit Configuration213
- Tomn Pin Output Setting215
- Cautions on Channel Output Operation216
- Collective Manipulation of Tomn Bit222
- Timer Interrupt and Tomn Pin Output at Count Operation Start224
- Timer Input (Timn) Control225
- Timn Input Circuit Configuration225
- Noise Filter225
- Cautions on Channel Input Operation226
- Independent Channel Operation Function of Timer Array Unit227
- Operation as Interval Timer/Square Wave Output227
- Operation as External Event Counter233
- Operation as Frequency Divider (Channels 0 and 3 Only)238
- Operation as Input Pulse Interval Measurement245
- Operation as Input Signal High-/Low-Level Width Measurement250
- Operation as Delay Counter255
- Simultaneous Channel Operation Function of Timer Array Unit260
- Operation as One-Shot Pulse Output Function260
- Operation as PWM Function270
- Operation as Multiple PWM Output Function279
- Operation as Two-Channel Input with One-Shot Pulse Output Function290
- Cautions When Using Timer Array Unit299
- Cautions When Using Timer Output299
Chapter 7 12-Bit Interval Timer300
- Functions of 12-Bit Interval Timer300
- Configuration of 12-Bit Interval Timer300
- Registers Controlling 12-Bit Interval Timer301
- Peripheral Enable Register 0 (PER0)301
- Operation Speed Mode Control Register (OSMC)302
- Interval Timer Control Register (ITMC)303
- 12-Bit Interval Timer Operation304
- 12-Bit Interval Timer Operation Timing304
- Start of Count Operation and Re-Enter to HALT/STOP Mode after Returned from HALT/STOP Mode305
Chapter 8 Clock Output/Buzzer Output Controller306
- Functions of Clock Output/Buzzer Output Controller306
- Configuration of Clock Output/Buzzer Output Controller307
- Registers Controlling Clock Output/Buzzer Output Controller307
- Clock Output Select Register 0 (CKS0)308
- Registers Controlling Port Functions of Clock Output/Buzzer Output Pin309
- Operations of Clock Output/Buzzer Output Controller310
- Operation as Output Pin310
Chapter 9 Watchdog Timer311
- Functions of Watchdog Timer311
- Configuration of Watchdog Timer312
- Register Controlling Watchdog Timer313
- Watchdog Timer Enable Register (WDTE)313
- Operation of Watchdog Timer314
- Controlling Operation of Watchdog Timer314
- Setting Time of Watchdog Timer315
Chapter 10 A/D Converter316
- Function of A/D Converter316
- Configuration of A/D Converter318
- Registers Controlling A/D Converter320
- Peripheral Enable Register 0 (PER0)321
- A/D Converter Mode Register 0 (ADM0)322
- A/D Converter Mode Register 2 (ADM2)326
- 10-Bit A/D Conversion Result Register (ADCR)327
- 8-Bit A/D Conversion Result Register (ADCRH)328
- Analog Input Channel Specification Register (ADS)329
- A/D Test Register (ADTES)330
- Registers Controlling Port Function of Analog Input Pins330
- A/D Converter Conversion Operations331
- Input Voltage and Conversion Results333
- A/D Converter Operation Modes335
- A/D Converter Setup Flowchart336
- Setting up ANI0 to ANI10 for A/D Conversion336
- Setting up the Internal Reference Voltage for A/D Conversion337
- How to Read A/D Converter Characteristics Table338
- Resolution338
- Overall Error338
- Quantization Error339
- Zero-Scale Error339
- Full-Scale Error339
- Integral Linearity Error339
- Differential Linearity Error340
- Conversion Time341
- Sampling Time341
- Notes on A/D Converter342
- Operating Current in STOP Mode342
- Input Voltage on ANI0 to ANI10 Pins342
- Conflicting Operations342
- Noise Countermeasures342
- Analog Input (Anin) Pins343
- Input Impedance of Analog Input (Anin) Pins344
- Interrupt Request Flag (ADIF)344
- Conversion Results Just after A/D Conversion Start344
- A/D Conversion Result Register (ADCR, ADCRH) Read Operation344
- 10.9.10 Internal Equivalent Circuit345
- 10.9.11 Starting the A/D Converter345
Chapter 11 Comparator346
- Comparator Functions346
- Comparator Configuration347
- Registers Controlling the Comparator349
- Peripheral Enable Register 0 (PER0)350
- Comparator Mode Setting Register (COMPMDR)351
- Comparator Filter Control Register (COMPFIR)353
- Comparator Output Control Register (COMPOCR)355
- Registers Controlling Port Functions of Comparator I/O Pins356
- Comparator N Operation (N = 0, 1)357
- Comparator N Digital Filter Operation (N = 0, 1)358
- Comparator N Interrupt Operation (N = 0, 1)358
- Comparator N Output (N = 0, 1)358
- Comparator Setting Flowcharts359
- Enabling Comparator Operation (in the Case of CMP0)360
- Disabling Comparator Operation (in the Case of CMP0)361
Chapter 12 Serial Array Unit362
- Functions of Serial Array Unit363
- Simplified SPI (CSI00, CSI01)363
- Uart (Uart0)364
- Simplified I C (IIC00, IIC01)365
- Configuration of Serial Array Unit366
- Shift Register368
- Lower 8 or 9 Bits of the Serial Data Register Mn (Sdrmn)369
- Registers to Control the Serial Array Unit371
- Peripheral Enable Register 0 (PER0)372
- Serial Clock Select Register M (Spsm)373
- Serial Mode Register Mn (Smrmn)374
- Serial Communication Operation Setting Register Mn (Scrmn)376
- Serial Data Register Mn (Sdrmn)379
- Serial Flag Clear Trigger Register Mn (Sirmn)381
- Serial Status Register Mn (Ssrmn)382
- Serial Channel Start Register M (Ssm)384
- Serial Channel Stop Register M (Stm)385
- Serial Channel Enable Status Register M (Sem)386
- Serial Output Enable Register M (Soem)387
- Serial Output Register M (Som)388
- Serial Output Level Register M (Solm)389
- Input Switch Control Register (ISC)391
- Noise Filter Enable Register 0 (NFEN0)392
- 12.3.16 Registers Controlling Port Functions of Serial Input/Output Pins393
- Operation Stop Mode394
- Stopping the Operation by Units394
- Stopping the Operation by Channels395
- Operation of Simplified SPI (CSI00, CSI01) Communication397
- Master Transmission399
- Master Reception408
- Master Transmission/Reception418
- Slave Transmission428
- Slave Reception437
- Slave Transmission/Reception444
- Calculating Transfer Clock Frequency455
- Procedure for Processing Errors that Occurred During Simplified SPI (CSI00, CSI01) Communication457
- Operation of UART (UART0) Communication458
- UART Transmission460
- UART Reception470
- Calculating Baud Rate477
- Procedure for Processing Errors that Occurred During UART (UART0) Communication482
- Operation of Simplified I C (IIC00, IIC01) Communication483
- Address Field Transmission485
- Data Transmission491
- Data Reception495
- Stop Condition Generation500
- Calculating Transfer Rate501
- Procedure for Processing Errors that Occurred During Simplified I504
- C (Iic00, Iic01)504
- Communication504
Chapter 13 Serial Interface Iica505
- Functions of Serial Interface IICA505
- Configuration of Serial Interface IICA508
- Registers Controlling Serial Interface IICA512
- Peripheral Enable Register 0 (PER0)513
- IICA Control Register 00 (IICCTL00)514
- IICA Status Register 0 (IICS0)518
- IICA Flag Register 0 (IICF0)521
- IICA Control Register 01 (IICCTL01)523
- IICA Low-Level Width Setting Register 0 (IICWL0)526
- IICA High-Level Width Setting Register 0 (IICWH0)526
- Registers Controlling Port Functions of IICA Serial Input/Output Pins527
- I 2 C Bus Mode Functions528
- Pin Configuration528
- Setting Transfer Clock by Using IICWL0 and IICWH0 Registers529
- I 2 C Bus Definitions and Control Methods531
- Start Condition532
- Address533
- Transfer Direction Specification534
- Acknowledge (ACK)534
- Stop Condition536
- Clock Stretching537
- Releasing Clock Stretching539
- Interrupt Request (INTIICA0) Generation Timing and Clock Stretching Control540
- Address Match Detection Method541
- 13.5.10 Error Detection541
- 13.5.11 Extension Code542
- 13.5.12 Arbitration543
- 13.5.13 Wakeup Function545
- 13.5.14 Communication Reservation548
- 13.5.15 Cautions552
- 13.5.16 Communication Operations554
- C Interrupt Request (INTIICA0) Generation Timing564
- Timing Charts585
Chapter 14 Interrupt Functions600
- Interrupt Function Types600
- Interrupt Sources and Configuration600
- Registers Controlling Interrupt Functions605
- Interrupt Request Flag Registers (IF0L, IF0H, IF1L, IF1H)607
- Interrupt Mask Flag Registers (MK0L, MK0H, MK1L, MK1H)609
- Priority Specification Flag Registers (PR00L, PR00H, PR01L, PR01H, PR10L, PR10H, PR11L, PR11H)610
- External Interrupt Rising Edge Enable Register (EGP0), External Interrupt Falling Edge Enable Register (EGN0)612
- Program Status Word (PSW)613
- Interrupt Servicing Operations614
- Maskable Interrupt Request Acknowledgment614
- Software Interrupt Request Acknowledgment617
- Multiple Interrupt Servicing617
- Interrupt Request Pending622
Chapter 15 Standby Function624
- Overview624
- Registers Controlling Standby Function625
- Standby Function Operation625
- HALT Mode625
- STOP Mode629
Chapter 16 Reset Function635
- Timing of Reset Operation637
- States of Operation During Reset Periods639
- Register for Confirming Reset Source641
- Reset Control Flag Register (RESF)641
Chapter 17 Selectable Power-On-Reset Circuit644
- Functions of Selectable Power-On-Reset Circuit644
- Configuration of Selectable Power-On-Reset Circuit645
- Operation of Selectable Power-On-Reset Circuit646
- Cautions for Selectable Power-On-Reset Circuit647
Chapter 18 Option Byte648
- Functions of Option Bytes648
- User Option Byte (000C0H to 000C2H)648
- On-Chip Debug Option Byte (000C3H)648
- Format of User Option Byte649
- Format of On-Chip Debug Option Byte652
- Setting of Option Byte653
Chapter 19 Flash Memory654
- Serial Programming Using Flash Memory Programmer656
- Programming Environment658
- Communication Mode658
- Writing to Flash Memory by Using External Device (that Incorporates UART)660
- Programming Environment660
- Communication Mode661
- Connection of Pins on Board662
- P40/TOOL0 Pin662
- RESET ¯¯¯¯¯¯ Pin663
- Port Pins663
- X1 and X2 Pins (16-Pin and 20-Pin Products)663
- Power Supply664
- Serial Programming Method665
- Serial Programming Procedure665
- Flash Memory Programming Mode666
- Selecting Communication Mode667
- Communication Commands667
- Processing Time for each Command When PG-FP5 Is in Use (Reference Values)668
- Self-Programming669
- Registers Controlling Self-Programming669
- Flash Address Pointer Registers H and L (FLAPH, FLAPL)670
- Flash End Address Specification Registers H and L (FLSEDH, FLSEDL)671
- Flash Write Buffer Registers HH, HL, LH, and LL (FLWHH, FLWHL, FLWLH, FLWLL)673
- Flash Programming Mode Control Register (FLPMC)674
- Flash Memory Sequencer Initial Setting Register (FSSET)675
- Flash Memory Sequencer Control Register (FSSQ)676
- Flash Memory Sequencer Status Registers H and L (FSASTH, FSASTL)677
- Procedure for Executing Self-Programming of Code/Data Flash Memory678
- Notes on Self-Programming681
- Data Flash682
- Data Flash Overview682
- Procedure for Accessing Data Flash Memory682
Chapter 20 On-Chip Debug Function683
- Connecting E2, E2 Lite On-Chip Debugging Emulator683
- Connecting External Device (that Incorporates UART)685
- On-Chip Debug Security ID686
- Securing of User Resources687
Chapter 21 Bcd Correction Circuit689
- BCD Correction Circuit Function689
- Registers Used by BCD Correction Circuit689
- BCD Correction Result Register (BCDADJ)689
- BCD Correction Circuit Operation690
Chapter 22 Instruction Set692
- Conventions Used in Operation List692
- Operand Identifiers and Specification Methods692
- Description of Operation Column694
- Description of Flag Operation Column695
- PREFIX Instruction695
- Operation List696
Chapter 23 Electrical Specifications709
- Absolute Maximum Ratings710
- Oscillator Characteristics711
- X1 Oscillator Characteristics711
- On-Chip Oscillator Characteristics711
- DC Characteristics712
- Pin Characteristics712
- Supply Current Characteristics714
- AC Characteristics716
- Serial Interface Characteristics719
- Serial Array Unit719
- Serial Interface IICA724
- Analog Characteristics725
- A/D Converter Characteristics725
- Comparator Characteristics726
- Internal Reference Voltage Characteristics726
- SPOR Circuit Characteristics727
- Power Supply Voltage Rising Slope Characteristics727
- RAM Data Retention Characteristics728
- Flash Memory Programming Characteristics729
- Dedicated Flash Memory Programmer Communication (UART)729
- 23.10 Timing of Entry to Flash Memory Programming Mode730
Chapter 24 Electrical Specifications (T +125°C)731
- CHAPTER 24 ELECTRICAL SPECIFICATIONS (T = −40 to +105°C, T = −40 to +125°C)731
- Absolute Maximum Ratings732
- Oscillator Characteristics733
- X1 Oscillator Characteristics733
- On-Chip Oscillator Characteristics733
- DC Characteristics734
- Pin Characteristics734
- Supply Current Characteristics736
- AC Characteristics738
- Serial Interface Characteristics741
- Serial Array Unit741
- Serial Interface IICA746
- Analog Characteristics747
- A/D Converter Characteristics747
- Comparator Characteristics748
- Internal Reference Voltage Characteristics748
- SPOR Circuit Characteristics749
- Power Supply Voltage Rising Slope Characteristics749
- RAM Data Retention Characteristics750
- Flash Memory Programming Characteristics751
- Dedicated Flash Memory Programmer Communication (UART)751
- 24.10 Timing of Entry to Flash Memory Programming Mode752
Chapter 25 Package Drawings753
- 8-Pin Products753
- 10-Pin Products754
- 16-Pin Products755
- 20-Pin Products757
Appendix A Revision History758
- Major Revisions in this Edition758
- Revision History of Preceding Editions760

Brand	Renesas
Model	RL78/G15
Category	Microcontrollers
Language	English

Renesas RL78/G15 User Manual

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