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89C51RB2-IM Datasheet(PDF) 5 Page - ATMEL Corporation |
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89C51RB2-IM Datasheet(HTML) 5 Page - ATMEL Corporation |
5 / 127 page 5 AT89C51RB2/RC2 4180C–8051–12/03 Table 2. C51 Core SFRs Mnemonic Add Name 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 Mnemonic Add Name 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 CKCKON1 AFh Clock Control Register 1 ------- SPIX2 Table 4. Interrupt SFRs Mnemonic Add Name 76543210 IEN0 A8h Interrupt Enable Control 0 EA EC ET2 ES ET1 EX1 ET0 EX0 IEN1 B1h Interrupt 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 IPH1 B3h Interrupt Priority Control High 1 ----- SPIH IE2CH KBDH IPL1 B2h Interrupt Priority Control Low 1 ----- SPIL IE2CL KBDL Table 5. Port SFRs Mnemonic Add Name 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 |
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