Special function registers – Rainbow Electronics AT89LP216 User Manual
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3621A–MICRO–6/06
AT89LP216 [Preliminary]
7.
Special Function Registers
A map of the on-chip memory area called the Special Function Register (SFR) space is shown in
.
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.
Notes:
1. All SFRs in the left-most column are bit-addressable.
2. Reset value is xx11 1111B when Tristate-Port Fuse is enabled and xx00 0000B when disabled.
Table 7-1.
AT89LP216 SFR Map and Reset Values
8
9
A
B
C
D
E
F
0F8H
0FFH
0F0H
B
0000 0000
0F7H
0E8H
SPSR
000x x000
SPCR
0000 0000
SPDR
xxxx xxxx
0EFH
0E0H
ACC
0000 0000
0E7H
0D8H
0DFH
0D0H
PSW
0000 0000
0D7H
0C8H
0CFH
0C0H
P1M1
xx00 0000
P3M0
P3M1
xx00 0000
0C7H
0B8H
IP
x000 0000
SADEN
0000 0000
0BFH
0B0H
P3
xx11 1111
IPH
x000 0000
0B7H
0A8H
IE
0000 0000
SADDR
0000 0000
0AFH
0A0H
AUXR1
xxxx 0xxx
WDTRST
(write-only)
WDTCON
0000 x000
0A7H
98H
SCON
0000 0000
SBUF
xxxx xxxx
GPMOD
0000 0000
GPLS
0000 0000
GPIEN
0000 0000
GPIF
0000 0000
9FH
90H
P1
1111 1111
TCONB
0010 0100
RL0
0000 0000
RL1
0000 0000
RH0
0000 0000
RH1
0000 0000
ACSR
xx00 0000
97H
88H
TCON
0000 0000
TMOD
0000 0000
TL0
0000 0000
TL1
0000 0000
TH0
0000 0000
TH1
0000 0000
CLKREG
0000 x000
8FH
80H
SP
0000 0111
DPL
0000 0000
DPH
0000 0000
PCON
0000 0000
87H
0
1
2
3
4
5
6
7