uPD789074 Subseries 8-Bit Single-Chip Microcontrollers UD - Home

CHAPTER 3 CPU ARCHITECTURETable 3-3. Special Function Registers (1/2)Address Special Function Register (SFR) Name Symbol R/WNumber of Bits Manipulated Simultaneously1 Bit 8 Bits 16 BitsAfter ResetFF00H Port 0 P0 R/W √ √ −00HFF01H Port 1 P1 √ √ −FF02H Port 2 P2 √ √ −FF03H Port 3 P3√ √ −FF16H16-bit compare register 90 CR90 Note 1 W − √ Note 2 √ Note 3 FFFFHFF17HFF18HFF19HFF1AH16-bit timer counter 90 TM90 Note 1 R − √ Note 2 √ Note 3 0000H16-bit capture register 90 TCP90 Note 1− √ Note 2 √ Note 3 UndefinedFF1BHFF20H Port mode register 0 PM0 R/W √ √ −FFHFF21H Port mode register 1 PM1 √ √ −FF22H Port mode register 2 PM2 √ √ −FF23H Port mode register 3 PM3 √ √ −FF32H Pull-up resistor option register B2 PUB2 √ √ −00HFF42HWatchdog timer clock selectionregister 2WDCS − √ −FF48H 16-bit timer mode control register 90 TMC90 √ √ −FF49H Buzzer output control register 90 BZC90√ √ −FF50H 8-bit compare register 80 CR80 W − √ − UndefinedFF51H 8-bit timer counter 80 TM80 R − √ −00HFF53H 8-bit timer mode control register 80 TMC80 R/W √ √ −FF70HAsynchronous serial interface moderegister 20ASIM20√ √ −FF71HAsynchronous serial interface statusregister 20ASIS20 R √ √ −FF72H Serial operation mode register 20 CSIM20 R/W √ √ −FF73H Baud rate generator control register 20 BRGC20− √ −Notes 1. These SFRs are for 16-bit access only.2. CR90, TM90, and TCP90 are designed only for 16-bit access. In direct addressing, however, 8-bitaccess can also be performed.3. 16-bit access is allowed only in short direct addressing.User’s Manual U14801EJ3V1UD 51