Renesas R8C/20 User Manual

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6.1.2 Monitoring Vdet2 ............................................................................................................................... 34
6.2 Voltage Monitor 1 Reset ......................................................................................................................... 35
6.3 Voltage Monitor 2 Interrupt and Voltage Monitor 2 Reset ..................................................................... 36
7. Programmable I/O Ports ............................................................................................................... 38
7.1 Functions of Programmable I/O Ports ..................................................................................................... 38
7.2 Effect on Peripheral Functions ................................................................................................................ 39
7.3 Pins Other than Programmable I/O Ports ................................................................................................ 39
7.4 Port Settings ............................................................................................................................................ 50
7.5 Unassigned Pin Handling ........................................................................................................................ 61
8. Processor Mode ............................................................................................................................ 62
8.1 Processor Modes ...................................................................................................................................... 62
9. Bus ................................................................................................................................................ 63
10. Clock Generation Circuit ............................................................................................................... 64
10.1 XIN Clock ............................................................................................................................................... 71
10.2 On-Chip Oscillator Clocks ...................................................................................................................... 72
10.2.1 Low-Speed On-Chip Oscillator Clock ................................................................................................ 72
10.2.2 High-Speed On-Chip Oscillator Clock ............................................................................................... 72
10.3 CPU Clock and Peripheral Function Clock ............................................................................................. 73
10.3.1 System Clock ...................................................................................................................................... 73
10.3.2 CPU Clock .......................................................................................................................................... 73
10.3.3 Peripheral Function Clock (f1, f2, f4, f8 and f32) .............................................................................. 73
10.3.4 fOCO ................................................................................................................................................... 73
10.3.5 fOCO40M ........................................................................................................................................... 73
10.3.6 fOCO-F ............................................................................................................................................... 73
10.3.7 fOCO-S ............................................................................................................................................... 73
10.3.8 fOCO128 ............................................................................................................................................. 73
10.4 Power Control .......................................................................................................................................... 74
10.4.1 Standard Operating Mode ................................................................................................................... 74
10.4.2 Wait Mode .......................................................................................................................................... 75
10.4.3 Stop Mode ........................................................................................................................................... 79
10.5 Oscillation Stop Detection Function ....................................................................................................... 82
10.5.1 How to Use Oscillation Stop Detection Function ............................................................................... 82
10.6 Notes on Clock Generation Circuit ......................................................................................................... 85
10.6.1 Stop Mode ........................................................................................................................................... 85
10.6.2 Wait Mode .......................................................................................................................................... 85
10.6.3 Oscillation Stop Detection Function ................................................................................................... 85
10.6.4 Oscillation Circuit Constants .............................................................................................................. 85
11. Protection ...................................................................................................................................... 86
12. Interrupts ....................................................................................................................................... 87
12.1 Interrupt Overview .................................................................................................................................. 87
12.1.1 Types of Interrupts .............................................................................................................................. 87
12.1.2 Software Interrupts ............................................................................................................................. 88
12.1.3 Special Interrupts ................................................................................................................................ 89

Renesas R8C/20 Specifications

General

Brand	Renesas
Model	R8C/20
Category	Control Unit
Language	English