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AT89S8252 Datasheet(PDF) 6 Page - ATMEL Corporation

Part No. AT89S8252
Description  8-bit Microcontroller with 8K Bytes Flash
Download  41 Pages
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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AT89S8252 Datasheet(HTML) 6 Page - ATMEL Corporation

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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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