R8C2K datasheet(12/471 Pages) RENESAS

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19.

A/D Converter ............................................................................................................................. 348

19.1

One-Shot Mode ..................................................................................................................................... 352

19.2

Repeat Mode .......................................................................................................................................... 355

19.3

Sample and Hold ................................................................................................................................... 358

19.4

A/D Conversion Cycles ......................................................................................................................... 358

19.5

Internal Equivalent Circuit of Analog Input .......................................................................................... 359

19.6

Output Impedance of Sensor under A/D Conversion ............................................................................ 360

19.7

Notes on A/D Converter ........................................................................................................................ 361

20.

Flash Memory ............................................................................................................................. 362

20.1

Overview ............................................................................................................................................... 362

20.2

Memory Map ......................................................................................................................................... 363

20.3

Functions to Prevent Rewriting of Flash Memory ................................................................................ 364

20.3.1

ID Code Check Function .................................................................................................................. 364

20.3.2

ROM Code Protect Function ............................................................................................................ 365

20.4

CPU Rewrite Mode ............................................................................................................................... 366

20.4.1

Register Description ......................................................................................................................... 367

20.4.2

Status Check Procedure .................................................................................................................... 373

20.4.3

EW0 Mode ........................................................................................................................................ 374

20.4.4

EW1 Mode ........................................................................................................................................ 384

20.5

Standard Serial I/O Mode ...................................................................................................................... 392

20.5.1

ID Code Check Function .................................................................................................................. 392

20.6

Parallel I/O Mode .................................................................................................................................. 395

20.6.1

ROM Code Protect Function ............................................................................................................ 395

20.7

Notes on Flash Memory ........................................................................................................................ 396

20.7.1

CPU Rewrite Mode ........................................................................................................................... 396

21.

Reducing Power Consumption ................................................................................................... 398

21.1

Overview ............................................................................................................................................... 398

21.2

Key Points and Processing Methods for Reducing Power Consumption ............................................. 398

21.2.1

Voltage Detection Circuit ................................................................................................................. 398

21.2.2

Ports .................................................................................................................................................. 398

21.2.3

Clocks ............................................................................................................................................... 398

21.2.4

Wait Mode, Stop Mode ..................................................................................................................... 398

21.2.5

Stopping Peripheral Function Clocks ............................................................................................... 398

21.2.6

Timers ............................................................................................................................................... 398

21.2.7

A/D Converter ................................................................................................................................... 398

21.2.8

Reducing Internal Power Consumption ............................................................................................ 399

21.2.9

Stopping Flash Memory .................................................................................................................... 400

21.2.10

Low-Current-Consumption Read Mode ........................................................................................... 401

22.

Electrical Characteristics ............................................................................................................ 402

23.

Usage Notes ............................................................................................................................... 423

23.1

Notes on Clock Generation Circuit ....................................................................................................... 423

23.1.1

Stop Mode ......................................................................................................................................... 423

23.1.2

Wait Mode ........................................................................................................................................ 423

23.1.3

Oscillation Stop Detection Function ................................................................................................. 423

23.1.4

Oscillation Circuit Constants ............................................................................................................ 423

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