AT89S8253-24SC View Datasheet(PDF) - Atmel Corporation
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AT89S8253-24SC Datasheet PDF : 59 Pages
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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.
Table 5-1. AT89S8253 SFR Map and Reset Values
0F8H
0F0H
B
00000000
0E8H
0E0H
ACC
00000000
0D8H
0D0H
0C8H
PSW
00000000
T2CON
00000000
T2MOD
XXXXXX00
RCAP2L
00000000
RCAP2H
00000000
TL2
00000000
0C0H
0B8H
IP
XX000000
SADEN
00000000
0B0H
P3
11111111
0A8H
IE
0X000000
SADDR
00000000
SPSR
000XXX00
0A0H
P2
11111111
98H
SCON
00000000
SBUF
XXXXXXXX
90H
P1
11111111
88H
TCON
00000000
TMOD
00000000
TL0
00000000
TL1
00000000
TH0
00000000
80H
P0
11111111
SP
00000111
DP0L
00000000
DP0H
00000000
DP1L
00000000
Note: # means: 0 after cold reset and unchanged after warm reset.
SPCR
00000100
TH2
00000000
TH1
00000000
DP1H
00000000
0FFH
0F7H
0EFH
0E7H
0DFH
0D7H
0CFH
0C7H
WDTRST
(Write Only)
EECON
XX000011
AUXR
XXXXXXX0
SPDR
########
0BFH
IPH
XX000000
0B7H
0AFH
WDTCON
0000 0000
0A7H
9FH
97H
CLKREG
8FH
XXXXXXX0
PCON
00XX0000
87H
7
3286H–MICRO–9/05
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