R5F212H1SDSP Ver la hoja de datos (PDF) - Renesas Electronics
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R5F212H1SDSP Datasheet PDF : 367 Pages
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20.4.2 Status Check Procedure .................................................................................................................... 267
20.4.3 EW0 Mode ........................................................................................................................................ 268
20.5 Standard Serial I/O Mode ...................................................................................................................... 274
20.5.1 ID Code Check Function .................................................................................................................. 274
20.6 Parallel I/O Mode .................................................................................................................................. 276
20.6.1 ROM Code Protect Function ............................................................................................................ 276
20.7 Notes on Flash Memory ........................................................................................................................ 277
20.7.1 CPU Rewrite Mode ........................................................................................................................... 277
21. Reducing Power Consumption ................................................................................................... 278
21.1 Overview ............................................................................................................................................... 278
21.2 Key Points and Processing Methods for Reducing Power Consumption ............................................. 278
21.2.1 Voltage Detection Circuit ................................................................................................................. 278
21.2.2 Ports .................................................................................................................................................. 278
21.2.3 Clocks ............................................................................................................................................... 278
21.2.4 Selecting Oscillation Drive Capacity (for R8C/2H Group only) ...................................................... 278
21.2.5 Wait Mode, Stop Mode ..................................................................................................................... 278
21.2.6 Stopping Peripheral Function Clocks ............................................................................................... 278
21.2.7 Timers ............................................................................................................................................... 278
21.2.8 Reducing Internal Power Consumption ............................................................................................ 279
21.2.9 Stopping Flash Memory .................................................................................................................... 280
21.2.10 Low-Current-Consumption Read Mode ........................................................................................... 281
22. Electrical Characteristics ............................................................................................................ 282
22.1 R8C/2H Group ...................................................................................................................................... 282
22.2 R8C/2J Group ........................................................................................................................................ 299
23. Usage Notes ............................................................................................................................... 316
23.1 Notes on I/O Ports ................................................................................................................................. 316
23.1.1 Port P4_3, P4_4 (for R8C/2H Group only) ...................................................................................... 316
23.2 Notes on Clock Generation Circuit ....................................................................................................... 317
23.2.1 Stop Mode ......................................................................................................................................... 317
23.2.2 Wait Mode ........................................................................................................................................ 317
23.2.3 Oscillation Circuit Constants ............................................................................................................ 317
23.3 Notes on Interrupts ................................................................................................................................ 318
23.3.1 Reading Address 00000h .................................................................................................................. 318
23.3.2 SP Setting .......................................................................................................................................... 318
23.3.3 External Interrupt and Key Input Interrupt ....................................................................................... 318
23.3.4 Changing Interrupt Sources .............................................................................................................. 319
23.3.5 Changing Interrupt Control Register Contents ................................................................................. 320
23.4 Notes on ID Code Areas ........................................................................................................................ 321
23.4.1 Setting Example of ID Code Areas ................................................................................................... 321
23.5 Notes on Option Function Select Area .................................................................................................. 322
23.5.1 Setting Example of Option Function Select Area ............................................................................. 322
23.6 Notes on Timers .................................................................................................................................... 323
23.6.1 Notes on Timer RA ........................................................................................................................... 323
23.6.2 Notes on Timer RB ........................................................................................................................... 324
23.6.3 Notes on Timer RE (for R8C/2H Group only) ................................................................................. 328
23.6.4 Notes on Timer RF ........................................................................................................................... 331
A-5
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