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AT89S8252 Datasheet(PDF) 6 Page - ATMEL Corporation |
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AT89S8252 Datasheet(HTML) 6 Page - ATMEL Corporation |
6 / 41 page 6 AT89S8252 0401G–MICRO–3/06 Special Function Registers A map of the on-chip memory area called the Special Function Register (SFR) space is shown in Table 1. Note that not all of the addresses are occupied, and unoccupied addresses may not be implemented on the chip. Read accesses to these addresses will in general return ran- dom 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. Timer 2 Registers Control and status bits are contained in registers T2CON (shown in Table 2) and T2MOD (shown in Table 9) for Timer 2. The register pair (RCAP2H, RCAP2L) are the Capture/Reload registers for Timer 2 in 16-bit capture mode or 16-bit auto-reload mode. Table 1. AT89S8252 SFR Map and Reset Values 0F8H 0FFH 0F0H B 00000000 0F7H 0E8H 0EFH 0E0H ACC 00000000 0E7H 0D8H 0DF H 0D0H PSW 00000000 SPCR 000001XX 0D7H 0C8H T2CON 00000000 T2MOD XXXXXX00 RCAP2L 00000000 RCAP2H 00000000 TL2 00000000 TH2 00000000 0CF H 0C0H 0C7H 0B8H IP XX000000 0BFH 0B0H P3 11111111 0B7H 0A8H IE 0X000000 SPSR 00XXXXXX 0AFH 0A0H P2 11111111 0A7H 98H SCON 00000000 SBUF XXXXXXXX 9FH 90H P1 11111111 WMCON 00000010 97H 88H TCON 00000000 TMOD 00000000 TL0 00000000 TL1 00000000 TH0 00000000 TH1 00000000 8FH 80H P0 11111111 SP 00000111 DP0L 00000000 DP0H 00000000 DP1L 00000000 DP1H 00000000 SPDR XXXXXXXX PCON 0XXX0000 87H |
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