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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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