R8C2H datasheet(12/67 Pages) RENESAS

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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

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