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AT89LP51 датащи(PDF) 23 Page - ATMEL Corporation |
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AT89LP51 датащи(HTML) 23 Page - ATMEL Corporation |
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23 / 113 page ![]() 23 3709B–MICRO–12/10 AT89LP51/52 - 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 0101 0101B when Tristate-Port Fuse is enabled and 0000 0011B when disabled. 3. Reset value is 0101 0010B when Compatibility mode is enabled and 0000 0000B when disabled. Table 4-1. AT89LP51/52 SFR Map and Reset Values 8 9A B C D E F 0F8H 0FFH 0F0H B 0000 0000 0F7H 0E8H 0EFH 0E0H ACC 0000 0000 0E7H 0D8H 0DFH 0D0H PSW 0000 0000 0D7H 0C8HT2CON 0000 0000 T2MOD 0000 0000 RCAP2L 0000 000 RCAP2H 0000 0000 TL2 0000 000 TH2 0000 0000 0CFH 0C0H P4 1111 1111 PMOD (2) 0C7H 0B8H IP xx00 0000 SADEN 0000 0000 0BFH 0B0H P3 1111 1111 IPH xx00 0000 0B7H 0A8H IE 0x00 0000 SADDR 0000 0000 0AFH 0A0H P2 1111 1111 AUXR1 0000 00x0 WDTRST (write-only) WDTCON 0000 0xx0 0A7H 98H SCON 0000 0000 SBUF xxxx xxxx 9FH 90H P1 1111 1111 TCONB 000x xxxx MEMCON 0000 00xx 97H 88H TCON 0000 0000 TMOD 0000 0000 TL0 0000 0000 TL1 0000 0000 TH0 0000 0000 TH1 0000 0000 AUXR 0000 0000 CLKREG (3) 8FH 80H P0 1111 1111 SP 0000 0111 DP0L 0000 0000 DP0H 0000 0000 DP1L 0000 0000 DP1H 0000 0000 PCON 000x 0000 87H 0 123 456 7 |
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