Name: Renesas R8C/20
Brand: Renesas
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represents information on the product at the time of publication and is subject to change by

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REJ09B0250-0200

R8C/20 Group, R8C/21 Group

Hardware Manual

RENESAS MCU

R8C FAMILY / R8C/2x SERIES

Rev.2.00

Revision Date: Aug 27, 2008

Default Chapter8
- Table of Contents8
- Overview17
1 Overview18
- Performance Overview18
- Block Diagram20
- Product Information21
- Pin Assignments23
- Pin Functions24
2 Central Processing Unit (CPU)26
- Data Registers (R0, R1, R2 and R3)27
  - Interrupt Enable Flag (I)28
3 Memory29
- R8C/21 Group30
4 Special Function Registers (Sfrs)31
5 Resets37
- Hardware Reset40
- Power-On Reset Function42
- Voltage Monitor 1 Reset43
6 Voltage Detection Circuit44
- VCC Input Voltage50
- Voltage Monitor 1 Reset51
- Voltage Monitor 2 Interrupt and Voltage Monitor 2 Reset52
7 Programmable I/O Ports54
- Effect on Peripheral Functions55
- Port Settings66
- Unassigned Pin Handling77
8 Processor Mode78
10 Clock Generation Circuit80
- XIN Clock87
- On-Chip Oscillator Clocks88
- CPU Clock and Peripheral Function Clock89
- Power Control90
- Notes on Clock Generation Circuit101
11 Protection102
- Interrupts103
- Software Interrupts104
- Special Interrupts105
- Interrupts and Interrupt Vector106
- Interrupt Control108
- INT Interrupt117
  - Inti Input Filter (I = 0 to 3)119
- Key Input Interrupt120
- Address Match Interrupt122
13 Watchdog Timer129
- Count Source Protection Mode Disabled132
- Count Source Protection Mode Enabled133
14 Timers134
- Timer RA136
- Timer RB153
- Timer RD175
- Count Source180
- Timer RD Interrupt265
  - Notes on Timer RD267
- Timer RE273
  - Output Compare Mode274
  - Notes on Timer RE280
15 Serial Interface281
- Clock Synchronous Serial I/O Mode287
  - Polarity Select Function290
  - Continuous Receive Mode291
- Clock Asynchronous Serial I/O (UART) Mode292
  - Bit Rate296
- Notes on Serial Interface297
- Clock Synchronous Serial Interface298
16 Clock Synchronous Serial Interface299
- Clock Synchronous Serial I/O with Chip Select (SSU)299
  - Transfer Clock308
  - SS Shift Register (SSTRSR)310
- Interrupt Requests311
17 Hardware LIN361
- Input/Output Pins362
- Register Configuration363
- Functional Description365
- Notes on Hardware LIN375
18 A/D Converter376
- One-Shot Mode380
- Repeat Mode383
- Sample and Hold386
- A/D Conversion Cycles387
- Internal Equivalent Circuit of Analog Input388
- Output Impedance of Sensor under A/D Conversion389
- Notes on A/D Converter390
19 Flash Memory391
- Memory Map393
- Functions to Prevent Rewriting of Flash Memory396
- Standard Serial I/O Mode416
- Parallel I/O Mode420
- Notes on Flash Memory421
20 Electrical Characteristics424
21 Usage Notes444
- Notes on Interrupts445
  - Changing Interrupt Sources446
  - Changing Interrupt Control Register Contents447
- Notes on Timers448
  - Notes on Timer RB449
- Notes on A/D Converter463
- Notes on Flash Memory464
- Notes on Noise467
22 Notes on On-Chip Debugger468
23 Notes on Emulator Debugger469
Appendix 1. Package Dimensions470
Appendix 2. Connection Examples between Serial Writer and On-Chip Debugging Emulator471
Appendix 3. Example of Oscillation Evaluation Circuit472
- Index473

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Renesas R8C/20 Specifications

General

Architecture	R8C
CPU Clock Speed	20 MHz
Flash Memory	8 KB to 32 KB
Serial Interfaces	UART, I2C, SPI
Operating Voltage	2.7 V to 5.5 V
Core	R8C
Timers	8-bit timer x 2
ADC	10-bit
Package	LQFP
Operating Temperature	-20°C to +85°C

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