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| AT89LP51_11 Datasheet, PDF (24/113 Pages) ATMEL Corporation – 8-bit Microcontroller with 4K/8K Bytes In-System Programmable Flash | |||
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4. Special Function Registers
A map of the on-chip memory area called the Special Function Register (SFR) space is shown in
Table 4-1.
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 in general return random data, and
write accesses will have an indeterminate effect. User software should not write to these unlisted
locations, since they may be used in future products to invoke new features.
Table 4-1. AT89LP51/52 SFR Map and Reset Values
8
9
A
B
C
D
E
F
0F8H
0FFH
0F0H
B
0000 0000
0F7H
0E8H
0EFH
0E0H
ACC
0000 0000
0E7H
0D8H
0DFH
0D0H
PSW
0000 0000
0C8H T2CON
T2MOD
RCAP2L RCAP2H
TL2
TH2
0000 0000 0000 0000 0000 000 0000 0000 0000 000 0000 0000
0C0H
P4
1111 1111
PMOD
(2)
0B8H
IP
xx00 0000
SADEN
0000 0000
0B0H
P3
1111 1111
0A8H
IE
0x00 0000
SADDR
0000 0000
0A0H
P2
1111 1111
AUXR1
0000 00x0
WDTRST
(write-only)
98H
SCON
0000 0000
SBUF
xxxx xxxx
90H
P1
1111 1111
TCONB
000x xxxx
MEMCON
0000 00xx
88H
TCON
0000 0000
TMOD
0000 0000
TL0
0000 0000
TL1
0000 0000
TH0
0000 0000
TH1
0000 0000
AUXR
0000 0000
80H
P0
1111 1111
SP
0000 0111
DP0L
0000 0000
DP0H
0000 0000
DP1L
0000 0000
DP1H
0000 0000
0
1
2
3
4
5
6
Notes: 1. All SFRs in the left-most column are bit-addressable.
2. Reset value is 0101 0101B when Tristate-Port Fuse is enabled and 0000 0011B when disabled.
3. Reset value is 0101 0010B when Compatibility mode is enabled and 0000 0000B when disabled.
IPH
xx00 0000
WDTCON
0000 0xx0
CLKREG
(3)
PCON
000x 0000
7
0D7H
0CFH
0C7H
0BFH
0B7H
0AFH
0A7H
9FH
97H
8FH
87H
24 AT89LP51/52 - Preliminary
3709CâMICROâ5/11
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