R8C20 datasheet(12/501 Pages) RENESAS

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18.4

A/D Conversion Cycles ......................................................................................................................... 371

18.5

Internal Equivalent Circuit of Analog Input .......................................................................................... 372

18.6

Output Impedance of Sensor Under A/D Conversion ........................................................................... 373

18.7

Notes on A/D Converter ........................................................................................................................ 374

19.

Flash Memory ............................................................................................................................. 375

19.1

Overview ............................................................................................................................................... 375

19.2

Memory Map ......................................................................................................................................... 377

19.3

Functions to Prevent Rewriting of Flash Memory ................................................................................ 380

19.3.1

ID Code Check Function .................................................................................................................. 380

19.3.2

ROM Code Protect Function ............................................................................................................ 381

19.4

CPU Rewrite Mode ............................................................................................................................... 382

19.4.1

EW0 Mode ........................................................................................................................................ 383

19.4.2

EW1 Mode ........................................................................................................................................ 383

19.4.3

Software Commands ......................................................................................................................... 392

19.4.4

Status Registers ................................................................................................................................. 397

19.4.5

Full Status Check .............................................................................................................................. 398

19.5

Standard Serial I/O Mode ...................................................................................................................... 400

19.5.1

ID Code Check Function .................................................................................................................. 400

19.6

Parallel I/O Mode .................................................................................................................................. 404

19.6.1

ROM Code Protect Function ............................................................................................................ 404

19.7

Notes on Flash Memory ........................................................................................................................ 405

19.7.1

CPU Rewrite Mode ........................................................................................................................... 405

20.

Electrical Characteristics ............................................................................................................ 408

21.

Usage Notes ............................................................................................................................... 428

21.1

Notes on Clock Generation Circuit ....................................................................................................... 428

21.1.1

Stop Mode ......................................................................................................................................... 428

21.1.2

Wait Mode ........................................................................................................................................ 428

21.1.3

Oscillation Stop Detection Function ................................................................................................. 428

21.1.4

Oscillation Circuit Constants ............................................................................................................ 428

21.2

Notes on Interrupts ................................................................................................................................ 429

21.2.1

Reading Address 00000h .................................................................................................................. 429

21.2.2

SP Setting .......................................................................................................................................... 429

21.2.3

External Interrupt and Key Input Interrupt ....................................................................................... 429

21.2.4

Changing Interrupt Sources .............................................................................................................. 430

21.2.5

Changing Interrupt Control Register Contents ................................................................................. 431

21.3

Notes on Timers .................................................................................................................................... 432

21.3.1

Notes on Timer RA ........................................................................................................................... 432

21.3.2

Notes on Timer RB ........................................................................................................................... 433

21.3.3

Notes on Timer RD ........................................................................................................................... 437

21.3.4

Notes on Timer RE ........................................................................................................................... 443

21.4

Notes on Serial Interface ....................................................................................................................... 444

21.5

Clock Synchronous Serial Interface ...................................................................................................... 445

21.5.1

Notes on Clock Synchronous Serial I/O with Chip Select ............................................................... 445

21.5.2

Notes on I2C Bus Interface ............................................................................................................... 445

21.6

Notes on Hardware LIN ........................................................................................................................ 446

21.7

Notes on A/D Converter ........................................................................................................................ 447

R8C20 Datasheet(PDF) 12 Page - Renesas Technology Corp

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