Datasheet

5
AT89C51RB2/RC2
4180E–8051–10/06
Table 2. C51 Core SFRs
MnemonicAddName 76543210
ACC E0h Accumulator
B F0h B Register
PSW D0h Program Status Word CY AC F0 RS1 RS0 OV F1 P
SP 81h Stack Pointer
DPL 82h Data Pointer Low Byte
DPH 83h Data Pointer High Byte
Table 3. System Management SFRs
MnemonicAddName 76543210
PCON 87h Power Control SMOD1 SMOD0 - POF GF1 GF0 PD IDL
AUXR 8Eh Auxiliary Register 0 DPU - M0 XRS2 XRS1 XRS0 EXTRAM AO
AUXR1 A2h Auxiliary Register 1 - - ENBOOT - GF3 0 - DPS
CKRL 97h Clock Reload Register CKRL7 CKRL6 CKRL5 CKRL4 CKRL3 CKRL2 CKRL1 CKRL0
CKCKON0 8Fh Clock Control Register 0 - WDTX2 PCAX2 SIX2 T2X2 T1X2 T0X2 X2
CKCKON1AFhClock Control Register 1-------SPIX2
Table 4. Interrupt SFRs
MnemonicAddName 76543210
IEN0 A8h Interrupt Enable Control 0 EA EC ET2 ES ET1 EX1 ET0 EX0
IEN1B1hInterrupt Enable Control 1 -----ESPI EI2C KBD
IPH0 B7h Interrupt Priority Control High 0 - PPCH PT2H PHS PT1H PX1H PT0H PX0H
IPL0 B8h Interrupt Priority Control Low 0 - PPCL PT2L PLS PT1L PX1L PT0L PX0L
IPH1B3hInterrupt Priority Control High 1-----SPIHIE2CHKBDH
IPL1B2hInterrupt Priority Control Low 1-----SPILIE2CLKBDL
Table 5. Port SFRs
MnemonicAddName 76543210
P0 80h 8-bit Port 0
P1 90h 8-bit Port 1
P2 A0h 8-bit Port 2
P3 B0h 8-bit Port 3