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AT89S8253 Datasheet(PDF) 7 Page - ATMEL Corporation |
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AT89S8253 Datasheet(HTML) 7 Page - ATMEL Corporation |
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7 / 59 page  7 3286H–MICRO–9/05 AT89S8253 5. Special Function Registers A map of the on-chip memory area called the Special Function Register (SFR) space is shown in Table 5-1. 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 generally return random data, and write accesses will have an indeterminate effect. User software should not write 1s to these unlisted locations, since they may be used in future products to invoke new features. In that case, the reset or inactive values of the new bits will always be 0. Note: # means: 0 after cold reset and unchanged after warm reset. Table 5-1. AT89S8253 SFR Map and Reset Values 0F8H 0FFH 0F0H B 00000000 0F7H 0E8H 0EFH 0E0H ACC 00000000 0E7H 0D8H 0DFH 0D0H PSW 00000000 SPCR 00000100 0D7H 0C8H T2CON 00000000 T2MOD XXXXXX00 RCAP2L 00000000 RCAP2H 00000000 TL2 00000000 TH2 00000000 0CFH 0C0H 0C7H 0B8H IP XX000000 SADEN 00000000 0BFH 0B0H P3 11111111 IPH XX000000 0B7H 0A8H IE 0X000000 SADDR 00000000 SPSR 000XXX00 0AFH 0A0H P2 11111111 WDTRST (Write Only) WDTCON 0000 0000 0A7H 98H SCON 00000000 SBUF XXXXXXXX 9FH 90H P1 11111111 EECON XX000011 97H 88H TCON 00000000 TMOD 00000000 TL0 00000000 TL1 00000000 TH0 00000000 TH1 00000000 AUXR XXXXXXX0 CLKREG XXXXXXX0 8FH 80H P0 11111111 SP 00000111 DP0L 00000000 DP0H 00000000 DP1L 00000000 DP1H 00000000 SPDR ######## PCON 00XX0000 87H |
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