R8CSLASH23 datasheet(13/549 Pages) RENESAS

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20.3.2

ROM Code Protect Function ............................................................................................................ 420

20.4

CPU Rewrite Mode ............................................................................................................................... 421

20.4.1

EW0 Mode ........................................................................................................................................ 422

20.4.2

EW1 Mode ........................................................................................................................................ 422

20.4.3

Software Commands ......................................................................................................................... 431

20.4.4

Status Registers ................................................................................................................................. 436

20.4.5

Full Status Check .............................................................................................................................. 437

20.5

Standard Serial I/O Mode ...................................................................................................................... 439

20.5.1

ID Code Check Function .................................................................................................................. 439

20.6

Parallel I/O Mode .................................................................................................................................. 443

20.6.1

ROM Code Protect Function ............................................................................................................ 443

20.7

Notes on Flash Memory ........................................................................................................................ 444

20.7.1

CPU Rewrite Mode ........................................................................................................................... 444

21.

Electrical Characteristics ............................................................................................................ 447

22.

Usage Notes ............................................................................................................................... 467

22.1

Notes on Clock Generation Circuit ....................................................................................................... 467

22.1.1

Stop Mode ......................................................................................................................................... 467

22.1.2

Wait Mode ........................................................................................................................................ 467

22.1.3

Oscillation Stop Detection Function ................................................................................................. 467

22.1.4

Oscillation Circuit Constants ............................................................................................................ 467

22.2

Notes on Interrupts ................................................................................................................................ 468

22.2.1

Reading Address 00000h .................................................................................................................. 468

22.2.2

SP Setting .......................................................................................................................................... 468

22.2.3

External Interrupt and Key Input Interrupt ....................................................................................... 468

22.2.4

Changing Interrupt Sources .............................................................................................................. 469

22.2.5

Changing Interrupt Control Register Contents ................................................................................. 470

22.3

Notes on Timers .................................................................................................................................... 471

22.3.1

Notes on Timer RA ........................................................................................................................... 471

22.3.2

Notes on Timer RB ........................................................................................................................... 472

22.3.3

Notes on Timer RD ........................................................................................................................... 476

22.3.4

Notes on Timer RE ........................................................................................................................... 482

22.4

Notes on Serial Interface ....................................................................................................................... 483

22.5

Clock Synchronous Serial Interface ...................................................................................................... 484

22.5.1

Notes on Clock Synchronous Serial I/O with Chip Select ............................................................... 484

22.5.2

Notes on I2C Bus Interface ............................................................................................................... 484

22.6

Notes on Hardware LIN ........................................................................................................................ 485

22.7

Notes on CAN Module .......................................................................................................................... 486

22.7.1

Reading C0STR Register .................................................................................................................. 486

22.7.2

Performing CAN Configuration ....................................................................................................... 488

22.7.3

Suggestions to Reduce Power Consumption .................................................................................... 489

22.8

Notes on A/D Converter ....................................................................................................................... 490

22.9

Notes on Flash Memory ........................................................................................................................ 491

22.9.1

CPU Rewrite Mode ........................................................................................................................... 491

22.10

Notes on Noise ..................................................................................................................................... 494

22.10.1

Inserting a Bypass Capacitor between VCC and VSS Pins as a Countermeasure against Noise and

Latch-up ............................................................................................................................................ 494

22.10.2

Countermeasures against Noise Error of Port Control Registers ..................................................... 494

R8C/23 Datasheet(PDF) 13 Page - Renesas Technology Corp

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