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AT89LP51RB2 Datasheet(PDF) 24 Page - ATMEL Corporation |
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AT89LP51RB2 Datasheet(HTML) 24 Page - ATMEL Corporation |
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24 / 254 page  24 3722A–MICRO–10/11 AT89LP51RB2/RC2/IC2 Preliminary 4. Special Function Registers A map of the on-chip memory area called the Special Function Register (SFR) space is shown in Table 4-1. Note that not all of the addresses are occupied, and unoccupied addresses may not be imple- mented on the chip. Read accesses to these addresses will in general return random data, and write accesses will have an indeterminate effect. User software should not write to these unlisted locations, since they may be used in future products to invoke new features. Notes: 1. All SFRs in the left-most column are bit-addressable. 2. Reset value is 1111 1111B when Tristate-Port Fuse is enabled and 0000 0000B when disabled. 3. Reset value is 0101 0010B when Compatibility mode is enabled and 0000 0000B when disabled. Table 4-1. Atmel AT89LP51RB2/RC2/IC2 SFR Map and Reset Values 8 9A B C D E F 0F8H CH 0000 0000 CCAP0H 0000 0000 CCAP1H 0000 0000 CCAP2H 0000 0000 CCAP3H 0000 0000 CCAP4H 0000 0000 0FFH 0F0H B 0000 0000 RL0 0000 0000 RL1 0000 0000 RH0 0000 0000 RH1 0000 0000 PAGE 0000 0000 BX 0000 0000 0F7H 0E8H CL 0000 0000 CCAP0L 0000 0000 CCAP1L 0000 0000 CCAP2L 0000 0000 CCAP3L 0000 0000 CCAP4L 0000 0000 SPX xxxx x000 0EFH 0E0H ACC 0000 0000 AX 0000 0000 DSPR 0000 0000 FIRD 0000 0000 MACL 0000 0000 MACH 0000 0000 P0M0 (2) P0M1 0000 0000 0E7H 0D8H CCON 00x0 0000 CMOD 00xx x000 CCAPM0 x000 0000 CCAPM1 x000 0000 CCAPM2 x000 0000 CCAPM3 x000 0000 CCAPM4 x000 0000 0DFH 0D0H PSW 0000 0000 FCON xxxx 0000 EECON 0000 0000 DPLB 0000 0000 DPHB 0000 0000 P1M0 (2) P1M1 0000 0000 0D7H 0C8HT2CON 0000 0000 T2MOD 0000 0000 RCAP2L 0000 000 RCAP2H 0000 0000 TL2 0000 000 TH2 0000 0000 P2M0 (2) P2M1 0000 0000 0CFH 0C0H P4 1111 1111 SPCON 0001 0100 SPSTA 0000 0000 SPDAT xxxx xxxx P3M0 (2) P3M1 0000 0000 0C7H 0B8H IPL0 xx00 0000 SADEN 0000 0000 AREF 0000 0000 P4M0 (2) P4M1 0000 0000 0BFH 0B0H P3 1111 1111 IEN1 xxxx 0000 IPL1 xxxx 0000 IPH1 xxxx 0000 IPH0 xx00 0000 0B7H 0A8H IEN0 0x00 0000 SADDR 0000 0000 ACSRB 0000 0000 DADL 0000 0000 DADH 0000 0000 CLKREG 0101 xxxx CKCON1 xxxx xxx0 0AFH 0A0H P2 1111 1111 DPCF 0000 xxxx AUXR1 0000 00x0 ACSRA 0000 0000 DADC 0000 0000 DADI 0000 0000 WDTRST (write-only) WDTPRG 0000 0xx0 0A7H 98H SCON 0000 0000 SBUF xxxx xxxx BRL 0000 0000 BDRCON xxx0 0000 KBLS 0000 0000 KBE 0000 0000 KBF 0000 0000 KBMOD 0000 0000 9FH 90H P1 1111 1111 TCONB 0010 0100 BMSEL xxxx xxx0 SSCON 0000 0000 SSCS 1111 1000 SSDAT 1111 1111 SSADR 1111 1110 CKRL 1111 1111 97H 88H TCON 0000 0000 TMOD 0000 0000 TL0 0000 0000 TL1 0000 0000 TH0 0000 0000 TH1 0000 0000 AUXR 0000 0000 CKCON0 0000 0000 8FH 80H P0 1111 1111 SP 0000 0111 DPL 0000 0000 DPH 0000 0000 CKSEL xxxx xxx0 OSCCON xxxx x001 PCON 000x 0000 87H 0 123 456 7 |
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