R8C27 Datasheet, PDF (12/485 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MCU R8C FAMILY / R8C/2x SERIES

18. A/D Converter ............................................................................................................................. 338
18.1 One-Shot Mode ..................................................................................................................................... 342
18.2 Repeat Mode .......................................................................................................................................... 345
18.3 Sample and Hold ................................................................................................................................... 348
18.4 A/D Conversion Cycles ......................................................................................................................... 348
18.5 Internal Equivalent Circuit of Analog Input .......................................................................................... 349
18.6 Output Impedance of Sensor under A/D Conversion ............................................................................ 350
18.7 Notes on A/D Converter ........................................................................................................................ 351
19. Flash Memory ............................................................................................................................. 352
19.1 Overview ............................................................................................................................................... 352
19.2 Memory Map ......................................................................................................................................... 353
19.3 Functions to Prevent Rewriting of Flash Memory ................................................................................ 355
19.3.1 ID Code Check Function .................................................................................................................. 355
19.3.2 ROM Code Protect Function ............................................................................................................ 356
19.4 CPU Rewrite Mode ............................................................................................................................... 357
19.4.1 EW0 Mode ........................................................................................................................................ 358
19.4.2 EW1 Mode ........................................................................................................................................ 358
19.4.3 Software Commands ......................................................................................................................... 367
19.4.4 Status Registers ................................................................................................................................. 372
19.4.5 Full Status Check .............................................................................................................................. 373
19.5 Standard Serial I/O Mode ...................................................................................................................... 375
19.5.1 ID Code Check Function .................................................................................................................. 375
19.6 Parallel I/O Mode .................................................................................................................................. 378
19.6.1 ROM Code Protect Function ............................................................................................................ 378
19.7 Notes on Flash Memory ........................................................................................................................ 379
19.7.1 CPU Rewrite Mode ........................................................................................................................... 379
20. Electrical Characteristics ............................................................................................................ 382
20.1 N, D Version .......................................................................................................................................... 382
20.2 J, K Version ........................................................................................................................................... 407
21. Usage Notes ............................................................................................................................... 427
21.1 Notes on Clock Generation Circuit ....................................................................................................... 427
21.1.1 Stop Mode ......................................................................................................................................... 427
21.1.2 Wait Mode ........................................................................................................................................ 427
21.1.3 Oscillation Stop Detection Function ................................................................................................. 427
21.1.4 Oscillation Circuit Constants ............................................................................................................ 427
21.2 Notes on Interrupts ................................................................................................................................ 428
21.2.1 Reading Address 00000h .................................................................................................................. 428
21.2.2 SP Setting .......................................................................................................................................... 428
21.2.3 External Interrupt and Key Input Interrupt ....................................................................................... 428
21.2.4 Changing Interrupt Sources .............................................................................................................. 429
21.2.5 Changing Interrupt Control Register Contents ................................................................................. 430
21.3 Notes on Timers .................................................................................................................................... 431
21.3.1 Notes on Timer RA ........................................................................................................................... 431
21.3.2 Notes on Timer RB ........................................................................................................................... 432
21.3.3 Notes on Timer RC ........................................................................................................................... 436
21.3.4 Notes on Timer RE ........................................................................................................................... 437
A-5