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A-5
20.4 Standard Serial I/O Mode ......................................................................................................................256
20.4.1 ID Code Check Function ................................................................................................................256
20.4.2 Example of Circuit Application in Standard Serial I/O Mode .......................................................... 260
20.5 Parallel I/O Mode ................................................................................................................................... 261
20.5.1 User ROM and Boot ROM Areas ................................................................................................... 261
20.5.2 ROM Code Protect Function ..........................................................................................................261
20.6 CAN I/O Mode ........................................................................................................................................262
20.6.1 ID Code Check Function ................................................................................................................262
20.6.2 Example of Circuit Application in CAN I/O Mode ...........................................................................265
21. Electrical Characteristics ................................................................................................. 266
22. Usage Precaution............................................................................................................ 276
22.1 SFR ........................................................................................................................................................ 276
22.2 External Clock ........................................................................................................................................ 277
22.3 PLL Frequency Synthesizer ................................................................................................................... 278
22.4 Power Control ........................................................................................................................................ 279
22.5 Oscillation Stop, Re-oscillation Detection Function ............................................................................... 281
22.6 Protection ............................................................................................................................................... 282
22.7 Interrupt.................................................................................................................................................. 283
22.7.1 Reading Address 00000h............................................................................................................... 283
22.7.2 Setting SP ...................................................................................................................................... 283
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22.7.3 NMI Interrupt .................................................................................................................................. 283
22.7.4 Changing Interrupt Generate Factor .............................................................................................. 284
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22.7.5 INT Interrupt ...................................................................................................................................284
22.7.6 Rewrite Interrupt Control Register ................................................................................................. 285
22.7.7 Watchdog Timer Interrupt .............................................................................................................. 285
22.8 DMAC ....................................................................................................................................................286
22.8.1 Write to DMAE Bit in DMiCON Register ........................................................................................ 286
22.9 Timers ....................................................................................................................................................287
22.9.1 Timer A ...........................................................................................................................................287
22.9.2 Timer B........................................................................................................................................... 291
22.10 Thee-Phase Motor Control Timer Function .......................................................................................... 293
22.11 Serial I/O .............................................................................................................................................. 294
22.11.1 Clock Synchronous Serial I/O Mode ............................................................................................294
22.11.2 Special Modes..............................................................................................................................295
22.11.3 SI/Oi .............................................................................................................................................296
22.12 A/D Converter ......................................................................................................................................297
22.13 CAN Module .........................................................................................................................................299
22.13.1 Reading C0STR Register ............................................................................................................ 299
22.13.2 Performing CAN Configuration .................................................................................................... 301
22.13.3 Suggestions to Reduce Power Consumption .............................................................................. 302
22.13.4 CAN Transceiver in Boot Mode.................................................................................................... 303
22.14 Programmable I/O Ports ...................................................................................................................... 304
22.15 Dedicated Input Pin ..............................................................................................................................305
22.16 Electrical Characteristic Differences Between Mask ROM and Flash Memory Version Microcomputers ..... 306
22.17 Mask ROM Version ............................................................................................................................. 307