Datasheet

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3286P–MICRO–3/10
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