A-5
20.4 Standard Serial I/O Mode ...................................................................................................................... 259
20.4.1 ID Code Check Function................................................................................................................ 259
20.4.2 Example of Circuit Application in Standard Serial I/O Mode.......................................................... 263
20.5 Parallel I/O Mode ...................................................................................................................................264
20.5.1 User ROM and Boot ROM Areas................................................................................................... 264
20.5.2 ROM Code Protect Function.......................................................................................................... 264
20.6 CAN I/O Mode........................................................................................................................................ 265
20.6.1 ID Code Check Function................................................................................................................ 265
20.6.2 Example of Circuit Application in CAN I/O Mode ...........................................................................268
21. Electrical Characteristics................................................................................................. 269
22. Usage Precaution............................................................................................................ 279
22.1 SFR ........................................................................................................................................................279
22.2 External Clock........................................................................................................................................ 280
22.3 PLL Frequency Synthesizer ...................................................................................................................281
22.4 Power Control ........................................................................................................................................282
22.5 Oscillation Stop, Re-oscillation Detection Function ............................................................................... 284
22.6 Protection............................................................................................................................................... 285
22.7 Interrupt.................................................................................................................................................. 286
22.7.1 Reading Address 00000h...............................................................................................................286
22.7.2 Setting SP ......................................................................................................................................286
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22.7.3 NMI Interrupt ..................................................................................................................................286
22.7.4 Changing Interrupt Generate Factor ..............................................................................................287
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22.7.5 INT Interrupt................................................................................................................................... 287
22.7.6 Rewrite Interrupt Control Register ................................................................................................. 288
22.7.7 Watchdog Timer Interrupt ..............................................................................................................288
22.8 DMAC .................................................................................................................................................... 289
22.8.1 Write to DMAE Bit in DMiCON Registe.......................................................................................... 289
22.9 Timers ....................................................................................................................................................290
22.9.1 Timer A........................................................................................................................................... 290
22.9.2 Timer B........................................................................................................................................... 294
22.10 Thee-Phase Motor Control Timer Function.......................................................................................... 296
22.11 Serial I/O ..............................................................................................................................................297
22.11.1 Clock Synchronous Serial I/O Mode ............................................................................................297
22.11.2 Special Modes..............................................................................................................................298
22.11.3 SI/Oi .............................................................................................................................................299
22.12 A/D Converter ...................................................................................................................................... 300
22.13 CAN Module......................................................................................................................................... 302
22.13.1 Reading CiSTR Register.............................................................................................................. 302
22.13.2 Performing CAN Configuration .................................................................................................... 304
22.13.3 Suggestions to Reduce Power Consumption .............................................................................. 305
22.13.4 CAN Transceiver in Boot Mode....................................................................................................306
22.14 Programmable I/O Ports ......................................................................................................................307
22.15 Dedicated Input Pin.............................................................................................................................. 308
22.16 Electrical Characteristic Differences Between Mask ROM and Flash Memory Version Microcomputers...... 309
22.17 Mask ROM Version .............................................................................................................................310