R5F211A3SP datasheet(13/339 Pages) RENESAS

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18. Flash Memory

245

18.1

Overview .................................................................................................245

18.2

Memory Map ...........................................................................................247

18.3

Functions to Prevent Rewriting of Flash Memory....................................249

18.3.1

ID Code Check Function ..................................................................249

18.3.2

ROM Code Protect Function ............................................................250

18.4

CPU Rewrite Mode..................................................................................251

18.4.1

EW0 Mode........................................................................................252

18.4.2

EW1 Mode........................................................................................252

18.4.3

Software Commands ........................................................................261

18.4.4

Status Register .................................................................................266

18.4.5

Full Status Check .............................................................................267

18.5

Standard Serial I/O Mode........................................................................269

18.5.1

ID Code Check Function ..................................................................269

18.6

Parallel I/O Mode.....................................................................................273

18.6.1

ROM Code Protect Function ............................................................273

18.7

Notes on Flash Memory ..........................................................................274

18.7.1

CPU Rewrite Mode...........................................................................274

19. Electrical Characteristics

276

20. Usage Notes

296

20.1

Notes on Clock Generation Circuit ..........................................................296

20.1.1

Stop Mode ........................................................................................296

20.1.2

Wait Mode ........................................................................................296

20.1.3

Oscillation Stop Detection Function..................................................296

20.1.4

Oscillation Circuit Constants.............................................................296

20.1.5

High-Speed On-Chip Oscillator Clock ..............................................296

20.2

Notes on Interrupts..................................................................................297

20.2.1

Reading Address 00000h .................................................................297

20.2.2

SP Setting.........................................................................................297

20.2.3

External Interrupt and Key Input Interrupt ........................................297

20.2.4

Watchdog Timer Interrupt.................................................................297

20.2.5

Changing Interrupt Sources..............................................................298

20.2.6

Changing Interrupt Control Register Contents .................................299

20.3

Precautions on Timers ............................................................................300

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