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

CHAPTER 3 CPU ARCHITECTURETable 3-3. Special Function Registers (2/2)Address Special Function Register (SFR) Name Symbol R/WNumber of Bits Manipulated Simultaneously1 Bit 8 Bits 16 BitsAfter ResetFF74HTransmission shift register 20 TXS20 SIO20 W − √ − FFHReceive buffer register 20RXB20R − √ − UndefinedFFE0H Interrupt request flag register 0 IF0 R/W √ √ −00HFFE1H Interrupt request flag register 1 IF1 √ √ −FFE4H Interrupt mask flag register 0 MK0 √ √ −FFHFFE5H Interrupt mask flag register 1 MK1 √ √ −FFECH External interrupt mode register 0 INTM0 − √ −00HFFF7H Pull-up resistor option register 0 PU0 √ √ −FFF9H Watchdog timer mode register WDTM √ √ −FFFAHOscillation stabilization time selectionregisterOSTS − √ − 04HFFFBH Processor clock control register PCC√ √ − 02H52User’s Manual U14801EJ3V1UD