Renesas M32R/ECU Series User Manual

12
12-48
SERIAL I/O
12.7 Receive Operation in UART Mode
32180 Group User's Manual (Rev.1.0)
12.7 Receive Operation in UART Mode
12.7.1 Initialization for UART Reception
To receive data in UART mode, initialize the serial I/O following the procedure described below.
(1) Setting SIO Transmit/Receive Mode Register
• Set the register to UART mode.
• Set parity (when enabled, select odd/even).
• Set the stop bit length.
• Set the character length.
Note: • During UART mode, settings of the internal/external clock select bit have no effect (only the
internal clock is useful).
(2) Setting SIO Transmit Control Register
• Set the clock divider’s divide-by ratio.
(3) Setting SIO Baud Rate Register
Set a baud rate generator value. (See Section 12.6.1, “Setting the UART Baud Rate.”)
(4) Setting SIO interrupt related registers
• Select the source of receive interrupt request (reception finished or receive error) (Interrupt Request
Source Select Register).
• Enable or disable receive interrupts (Interrupt Request Enable Register).
(5) Setting Interrupt Controller
To use interrupts during reception, set their priority levels.
(6) Setting DMAC
To issue DMA transfer requests to the internal DMAC when reception has finished, set up the DMAC. (See
Chapter 9, “DMAC.”)
(7) Selecting pin functions
Because the serial I/O related pins serve dual purposes, set the pin functions for use as SIO pins or input/
output ports. (See Chapter 8, “Input/Output Ports and Pin Functions.”)

Renesas M32R/ECU Series Specifications

General

Brand	Renesas
Model	M32R/ECU Series
Category	Computer Hardware
Language	English

Summary

Before Use

Guide to Understanding the Register Table

Explains the conventions used in register tables, including bit numbering, register borders, status after reset, shaded bits, and read/write conditions.

CHAPTER 1 OVERVIEW

1.1 Outline of the 32180 Group

Provides an overview of the 32180 group, belonging to the M32R/ECU series of Mitsubishi microcomputers.

1.3 Pin Functions

Describes the functions of each pin on the 32180, including primary and alternative functions.

1.4 Pin Assignments

Provides the pin assignment diagram and table for the 240QFP package.

CHAPTER 4 EIT

4.2 EIT Events

Details the types of exceptions (RIE, AE, FPE), underflow, inexact, and zero division exceptions.

CHAPTER 5 INTERRUPT CONTROLLER (ICU)

5.2 ICU Related Registers

Shows a register map associated with the Interrupt Controller (ICU), including Interrupt Vector Register and Interrupt Request Mask Register.

CHAPTER 6 INTERNAL MEMORY

6.1 Outline of the Internal Memory

Details the types of memory contained within the 32180: 48-Kbyte RAM and 1-Mbyte flash memory.

6.5 Programming the Internal Flash Memory

Explains the methods for programming or erasing the internal flash memory, including boot mode and single-chip mode.

CHAPTER 7 RESET

7.1 Outline of Reset

Describes the microcomputer reset mechanism via the RESET# input pin and the execution from the reset vector entry.

7.2 Reset Operation

Details reset operations such as power-on reset, reset during operation, reset at entering RAM backup mode, and reset vector relocation during flash programming.

CHAPTER 8 INPUT/OUTPUT PORTS AND PIN FUNCTIONS

8.1 Outline of Input/Output Ports

Details the total number of input/output ports and their dual/triple function capabilities.

8.2 Selecting Pin Functions

Explains how pin functions are selected based on the current operation mode or by setting port operation mode registers.

8.3 Input/Output Port Related Registers

Lists the port data registers, port direction registers, and port operation mode registers.

CHAPTER 9 DMAC

9.2 DMAC Related Registers

Shows a memory map of the DMAC related registers, including channel control, source address, and destination address registers.

CHAPTER 10 MULTIJUNCTION TIMERS

10.1 Outline of Multijunction Timers

Introduces the multijunction timers (MJT), their input/output event buses, and the six types of MJT provided.

10.2 Common Units of Multijunction Timers

Details the common units within MJTs: Prescaler, Clock Bus, Input/Output Event Bus Control, Input Processing, Output Flip-flop, and Interrupt Control Units.

10.3 TOP (Output-Related 16-Bit Timer)

Describes the TOP timer, its specifications, modes of operation (single-shot, delayed, continuous), and interrupt generation.

CHAPTER 11 A-D CONVERTERS

11.2 A-D Converter Related Registers

Shows the A-D converter related register map, including single mode, scan mode, and data registers.

11.3 Functional Description of A-D Converters

Explains how to find analog input voltages, A-D conversion by successive approximation, comparator operation, and conversion time.

CHAPTER 12 SERIAL I/O

12.2 Serial I/O Related Registers

Shows the serial I/O related register map, including interrupt and buffer registers.

CHAPTER 13 CAN MODULE

13.2 CAN Module Related Registers

Provides the CAN module related register map, covering control, status, frame format, and mask registers.

CHAPTER 14 REAL TIME DEBUGGER (RTD)

14.1 Outline of the Real-Time Debugger (RTD)

Explains the RTD as a serial I/O for reading/writing internal RAM locations via external commands without stopping the CPU.

14.3 Functional Description of the RTD

Details RTD operations for commands like VER, VEI, RDR, WRR, and RCV.

CHAPTER 15 EXTERNAL BUS INTERFACE

15.2 External Bus Interface Related Registers

Shows the register map for the external bus interface, including port operation mode registers.

CHAPTER 16 WAIT CONTROLLER

16.2 Wait Controller Related Registers

Shows the Wait Controller related register map, including CS Area Wait Control Registers.

CHAPTER 17 RAM BACKUP MODE

17.1 Outline of RAM Backup Mode

Describes RAM backup mode where internal RAM contents are retained when power is off, used for power saving or when power is down.

CHAPTER 19 JTAG

19.1 Outline of JTAG

19.3 JTAG Registers

19.4 Basic Operation of JTAG

CHAPTER 21 ELECTRICAL CHARACTERISTICS

21.1 Absolute Maximum Ratings

Lists the absolute maximum ratings for various parameters such as power supply, input/output voltage, and temperature.

21.2 Electrical Characteristics when VCCE = 5 V, f(XIN) = 10 MHz

21.3 Electrical Characteristics when VCCE = 5 V, f(XIN) = 8 MHz

21.4 Electrical Characteristics when VCCE = 3.3 V, f(XIN) = 10 MHz

21.5 Electrical Characteristics when VCCE = 3.3 V, f(XIN) = 8 MHz

21.7 A.C. Characteristics (when VCCE = 5 V)

21.8 A.C. Characteristics (when VCCE = 3.3 V)

APPENDIX 4 SUMMARY OF PRECAUTIONS

Appendix 4.4 Precautions To Be Observed when Programming Internal Flash Memory

Details precautions for programming/erasing internal flash memory, including voltage transitions and pin usage.

Appendix 4.9 Precautions about the A-D Converters