A-1
Table of contents

1. Usage Precaution.......................................................................................... 1

1.1 Precautions for Power Control .................................................................................... 1
1.2 Precautions for Protect ................................................................................................ 2
1.3 Precautions for Interrupts............................................................................................ 3
1.3.1 Reading address 0000016 ...................................................................................................................3
1.3.2 Setting the SP....................................................................................................................................... 3
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1.3.3 The NMI Interrupt .................................................................................................................................3
1.3.4 Changing the Interrupt Generate Factor............................................................................................ 4
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1.3.5 INT Interrupt ......................................................................................................................................... 4
1.3.6 Rewrite the Interrupt Control Register............................................................................................... 5
1.3.7 Watchdog Timer Interrupt ...................................................................................................................6
1.4 Precautions for DMAC.................................................................................................. 7
1.4.1 Write to DMAE Bit in DMiCON Register .............................................................................................7
1.5 Precautions for Timers................................................................................................. 8
1.5.1 Timer A.................................................................................................................................................. 8
1.5.1.1 Timer A (Timer Mode) ...................................................................................................................8
1.5.1.2 Timer A (Event Counter Mode) ....................................................................................................9
1.5.1.3 Timer A (One-shot Timer Mode).................................................................................................10
1.5.1.4 Timer A (Pulse Width Modulation Mode) ..................................................................................11
1.5.2 Timer B................................................................................................................................................ 12
1.5.2.1 Timer B (Timer Mode) .................................................................................................................12
1.5.2.2 Timer B (Event Counter Mode) ..................................................................................................13
1.5.2.3 Timer B (Pulse Period/pulse Width Measurement Mode) ...................................................... 14
1.6 Precautions for Serial I/O (Clock-synchronous Serial I/O) ..................................... 15
1.6.1 Transmission/reception..................................................................................................................... 15
1.6.2 Transmission...................................................................................................................................... 16
1.6.3 Reception............................................................................................................................................ 17
1.7 Precautions for Serial I/O (UART Mode) ................................................................... 18
1.7.1 Special Mode 2 ..................................................................................................................................18
1.7.2 Special Mode 4 (SIM Mode).............................................................................................................. 18
1.8 Precautions for A-D Converter .................................................................................. 19
1.9 Precautions for Programmable I/O Ports ................................................................. 21