A-5
20. Programmable I/O Ports ................................................................................................. 247
20.1 PDi Register........................................................................................................................................... 248
20.2 Pi Register, PC14 Register ....................................................................................................................248
20.3 PURj Register ........................................................................................................................................248
20.4 PCR Register .........................................................................................................................................248
21. Flash Memory Version ....................................................................................................260
21.1 Memory Map ..........................................................................................................................................261
21.1.1 Boot Mode...................................................................................................................................... 262
21.2 Functions to Prevent Flash Memory from Rewriting ..............................................................................262
21.2.1 ROM Code Protect Function.......................................................................................................... 262
21.2.2 ID Code Check Function................................................................................................................ 262
21.3 CPU Rewrite Mode ................................................................................................................................264
21.3.1 EW0 Mode .....................................................................................................................................265
21.3.2 EW1 Mode .....................................................................................................................................265
21.3.3 FMR0, FMR1 Registers .................................................................................................................266
21.3.4 Precautions on CPU Rewrite Mode ...............................................................................................271
21.3.5 Software Commands .....................................................................................................................273
21.3.6 Data Protect Function ....................................................................................................................278
21.3.7 Status Register (SRD Register)..................................................................................................... 278
21.3.8 Full Status Check........................................................................................................................... 280
21.4 Standard Serial I/O Mode ......................................................................................................................282
21.4.1 ID Code Check Function................................................................................................................ 282
21.4.2 Example of Circuit Application in Standard Serial I/O Mode.......................................................... 286
21.5 Parallel I/O Mode ...................................................................................................................................287
21.5.1 User ROM and Boot ROM Areas................................................................................................... 287
21.5.2 ROM Code Protect Function.......................................................................................................... 287
21.6 CAN I/O Mode........................................................................................................................................ 288
21.6.1 ID Code Check Function................................................................................................................ 288
21.6.2 Example of Circuit Application in CAN I/O Mode........................................................................... 291
22. Electrical Characteristics................................................................................................. 292
22.1 Electrical Characteristics (Normal-ver.)..................................................................................................292
22.2 Electrical Characteristics (T/V-ver.)........................................................................................................328
23. Usage Precaution............................................................................................................ 338
23.1 SFR........................................................................................................................................................ 338
23.1 External Bus........................................................................................................................................... 339
23.3 External Clock........................................................................................................................................ 340
23.4 PLL Frequency Synthesizer................................................................................................................... 341
23.5 Power Control ........................................................................................................................................342
23.6 Oscillation Stop, Re-oscillation Detection Function ...............................................................................344
23.7 Protection............................................................................................................................................... 345
23.8 Interrupt.................................................................................................................................................. 346
23.8.1 Reading Address 00000h...............................................................................................................346
23.8.2 Setting SP...................................................................................................................................... 346
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23.8.3 NMI Interrupt.................................................................................................................................. 346
23.8.4 Changing Interrupt Generate Factor.............................................................................................. 347
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23.8.5 INT Interrupt................................................................................................................................... 347
23.8.6 Rewrite Interrupt Control Register .................................................................................................348
23.8.7 Watchdog Timer Interrupt ..............................................................................................................348