Rev. B - 30-Mar-01

3

Preliminary

T89C51RB2/RC2

4. SFR Mapping

The Special Function Registers (SFRs) of the T89C51RB2/RC2 fall into the following categories:

• C51 core registers: ACC, B, DPH, DPL, PSW, SP

• I/O port registers: P0, P1, P2, P3

• Timer registers: T2CON, T2MOD, TCON, TH0, TH1, TH2, TMOD, TL0, TL1, TL2, RCAP2L, RCAP2H

• Serial I/O port registers: SADDR, SADEN, SBUF, SCON

• PCA ( Programmable Counter Array ) registers : CCON , CCAPMx , CL , CH , CCAPxH , CCAPxL (x : 0 to 4)

• Power and clock control registers: PCON

• Hardware Watchdog Timer registers : WDTRST, WDTPRG

• Interrupt system registers: IE0, IPL0, IPH0 , IE1 , IPL1 , IPH1

• Keyboard Interface registers : KBE , KBF , KBLS

• SPI registers : SPCON , SPSTR , SPDAT

• BRG ( Baud Rate Generator ) registers : BRL , BDRCON

• Flash register : FCON

• Clock Prescaler register : CKRL

• Others: AUXR, AUXR1 , CKCON0 , CKCON1