SFR Mapping
The Special Function Registers (SFRs) of the T89C51RD2 fall into the following
categories:
• C51 core registers: ACC, B, DPH, DPL, PSW, SP, AUXR1
• I/O port registers: P0, P1, P2, P3, P4, P5
• Timer registers: T2CON, T2MOD, TCON, TH0, TH1, TH2, TMOD, TL0, TL1, TL2,
RCAP2L, RCAP2H
• Serial I/O port registers: SADDR, SADEN, SBUF, SCON
• Power and clock control registers: PCON
• Hardware Watchdog Timer register: WDTRST, WDTPRG
• Interrupt system registers: IE, IP, IPH
• Flash and EEPROM registers: FCON, EECON, EETIM
• Others: AUXR, AUXR1, CKCON
8 T89C51RD2
4243G–8051–05/03