R8C2G 查看數據表（PDF） - Renesas Electronics
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R8C2G Datasheet PDF : 344 Pages
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20.4.3 EW0 Mode ........................................................................................................................................ 255
20.4.4 EW1 Mode ........................................................................................................................................ 261
20.5 Standard Serial I/O Mode ...................................................................................................................... 266
20.5.1 ID Code Check Function .................................................................................................................. 266
20.6 Parallel I/O Mode .................................................................................................................................. 268
20.6.1 ROM Code Protect Function ............................................................................................................ 268
20.7 Notes on Flash Memory ........................................................................................................................ 269
20.7.1 CPU Rewrite Mode ........................................................................................................................... 269
21. Reducing Power Consumption ................................................................................................... 271
21.1 Overview ............................................................................................................................................... 271
21.2 Key Points and Processing Methods for Reducing Power Consumption ............................................. 271
21.2.1 Voltage Detection Circuit ................................................................................................................. 271
21.2.2 Ports .................................................................................................................................................. 271
21.2.3 Clocks ............................................................................................................................................... 271
21.2.4 Selecting Oscillation Drive Capacity ................................................................................................ 271
21.2.5 Wait Mode, Stop Mode ..................................................................................................................... 271
21.2.6 Stopping Peripheral Function Clocks ............................................................................................... 271
21.2.7 Timers ............................................................................................................................................... 271
21.2.8 Reducing Internal Power Consumption ............................................................................................ 272
21.2.9 Stopping Flash Memory .................................................................................................................... 273
21.2.10 Low-Current-Consumption Read Mode ........................................................................................... 274
22. Electrical Characteristics ............................................................................................................ 275
23. Usage Notes ............................................................................................................................... 292
23.1 Notes on I/O Ports ................................................................................................................................. 292
23.1.1 Port P4_3, P4_4 ................................................................................................................................ 292
23.2 Notes on Clock Generation Circuit ....................................................................................................... 293
23.2.1 Stop Mode ......................................................................................................................................... 293
23.2.2 Wait Mode ........................................................................................................................................ 293
23.2.3 Oscillation Circuit Constants ............................................................................................................ 293
23.3 Notes on Interrupts ................................................................................................................................ 294
23.3.1 Reading Address 00000h .................................................................................................................. 294
23.3.2 SP Setting .......................................................................................................................................... 294
23.3.3 External Interrupt and Key Input Interrupt ....................................................................................... 294
23.3.4 Changing Interrupt Sources .............................................................................................................. 295
23.3.5 Changing Interrupt Control Register Contents ................................................................................. 296
23.4 Notes on ID Code Areas ........................................................................................................................ 297
23.4.1 Setting Example of ID Code Areas ................................................................................................... 297
23.5 Notes on Option Function Select Area .................................................................................................. 298
23.5.1 Setting Example of Option Function Select Area ............................................................................. 298
23.6 Notes on Timers .................................................................................................................................... 299
23.6.1 Notes on Timer RA ........................................................................................................................... 299
23.6.2 Notes on Timer RB ........................................................................................................................... 300
23.6.3 Notes on Timer RE ........................................................................................................................... 304
23.6.4 Notes on Timer RF ........................................................................................................................... 307
23.7 Notes on Serial Interface ....................................................................................................................... 308
23.8 Notes on Hardware LIN ........................................................................................................................ 309
A-5
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