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24. Precautions
24.1
SFR .........................................................................................................359
24.1.1
Register Settings ..............................................................................359
24.2
Reset .......................................................................................................360
24.3
Bus ..........................................................................................................361
24.4
PLL Frequency Synthesizer ....................................................................362
24.5
Power Control..........................................................................................363
24.6
Protect .....................................................................................................365
24.7
Interrupt ...................................................................................................366
24.7.1
Reading address 00000h .................................................................366
24.7.2
Setting the SP...................................................................................366
24.7.3
The NMI Interrupt .............................................................................366
24.7.4
Changing the Interrupt Generate Factor...........................................367
24.7.5
INT Interrupt .....................................................................................367
24.7.6
Rewrite the Interrupt Control Register ..............................................368
24.7.7
Watchdog Timer Interrupt.................................................................368
24.8
DMAC......................................................................................................369
24.8.1
Write to DMAE Bit in DMiCON Register ...........................................369
24.9
Timers .....................................................................................................370
24.9.1
Timer A .............................................................................................370
24.9.2
Timer B .............................................................................................372
24.10 Serial interface ........................................................................................373
24.10.1 Clock Synchronous Serial I/O...........................................................373
24.10.2 UART................................................................................................374
24.10.3 SI/O3, SI/O4 .....................................................................................374
24.11 A/D Converter..........................................................................................375
24.12 Programmable I/O Ports..........................................................................377
24.13 Electric Characteristic Differences Between Mask ROM
and Flash Memory Version Microcomputers...........................................378
24.14 Mask ROM ..............................................................................................378
24.15 Flash Memory Version ............................................................................379
24.15.1 Functions to Inhibit Rewriting Flash Memory Rewrite ......................379
24.15.2 Stop mode ........................................................................................379
24.15.3 Wait mode ........................................................................................379
24.15.4 Low power dissipation mode, on-chip oscillator low power dissipation mode ....379
24.15.5 Writing command and data...............................................................379
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