IBM Table 3-2. Special-Function Register List (1/2)

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CHAPTER 3 CPU ARCHITECTURE
Address Special-Function Register (SFR) Name Symbol R/W After Reset
FF00H Port0 P0 R/W √√— 00H
FF01H Port1 P1 √√—
FF03H Port3 P3 √√—
FF05H Port5 P5 √√—
FF07H Port7 P7 √√—
FF0AH Port10 P10 √√—
FF1FH A/D conversion result register ADCR R √√— Undefined
FF20H Port mode register 0 PM0 R/W √√ — FFH
FF21H Port mode register 1 PM1 √√—
FF23H Port mode register 3 PM3 √√—
FF25H Port mode register 5 PM5 √√—
FF27H Port mode register 7 PM7 √√—
FF2AH Port mode register 10 PM10 √√—
FF40H Timer clock select register 0 TCL0 √√— 00H
FF42H Timer clock select register 2 TCL2 — √—
FF50H Compare Register 50 CR50 — √—
FF51H 8-bit timer register 5 TM5 R — √—
FF52H Timer clock select register 5 TCL5 R/W — √—
FF53H 8-bit timer mode control register 5 TMC5 √√ —
FF54H Compare Register 60 CR60 — √—
FF55H 8-bit timer register 6 TM6 R — √—
FF56H Timer clock select register 6 TCL6 R/W — √—
FF57H 8-bit timer mode control register 6 TMC6 √√ —
FF70H Asynchronous serial interface mode register ASIM √√—
FF71H Asynchronous serial interface status register ASIS R √√—
FF72H Serial operating mode register 2 CSIM2 R/W √√ —
FF73H Baud rate generator control register BRGC — √—
FF74H Transmit shift register TXS SIO2 W — √— FFH
Receive buffer register RXB R
FF80H A/D converter mode register ADM R/W √√ — 01H
FF84H A/D converter input select register ADIS — √— 00H
FFE0H Interrupt request flag register 0L IF0 IF0L √√ √
FFE1H Interrupt request flag register 0H IF0H √√
FFE2H Interrupt request flag register 1L IF1L √√—
FFE4H Interrupt mask flag register 0L MK0 MK0L √√ √FFH
FFE5H Interrupt mask flag register 0H MK0H √√
FFE6H Interrupt mask flag register 1L MK1L √√ —
FFE8H Priority order specify flag register 0L PR0 PR0L √√ √
FFE9H Priority order specify flag register 0H PR0H √√
Table 3-2. Special-Function Register List (1/2)
Manipulatable Bit Unit
8 bits1 bit 16 bits