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Table 2: Special Function Registers- Functional Blocks (cont'd)
Block
Symbol
Ports
P0
P1
P2
P3
P4
P5
P6
Pow.Sav.M
PCON
odes
Serial
ADCON
Channels
PCON
SBUF
SCON
Timer 0/
TCON
Timer 1
TH0
TH1
TL0
TL1
TMOD
Watchdog
2)
IEN0
IEN1
2)
IP0
2)
IP1
2)
1)
Bit-addressable special function registers
2)
This special function register is listed repeatedly since some bits of it also belong
to other functional blocks.
3)
X means that the value is indeterminate and the location is reserved
Semiconductor Group
Name
Port 0
Port 1
Port 2
Port 3
Port 4
Port 5
Port 6, Analog/Digital Input
Power Control Register
A/D Converter Control Reg.
2)
Power Control Register
2)
Serial Channel Buffer Reg.
Serial Channel Control Reg.
Timer Control Register
Timer 0, High Byte
Timer 1, High Byte
Timer 0, Low Byte
Timer 1, Low Byte
Timer Mode Register
Interrupt Enable Register 0
Interrupt Enable Register 1
Interrupt Priority Register 0
Interrupt Priority Register 1
Address
80
90
0A0
0B0
0E8
0F8
0DB
87
0D8
87
99
98
88
8C
8D
*
8A
8B
89
0A8
0B8
0A9
0B9
234
Device Specifications
Contents
after Reset
1)
0FF
H
H
1)
0FF
H
H
1)
0FF
H
H
1)
0FF
H
H
1)
0FF
H
H
1)
0FF
H
H
H
000X 0000
H
1)
00X0 0000
H
000X 0000
H
0XX
3)
H
H
1)
00
H
H
1)
00
H
H
00
H
H
00
H
H
00
H
H
00
H
H
00
H
H
1)
00
H
H
1)
00
H
H
X000 0000
H
XX00 0000
H
2)
B
2)
B
2)
B
2)
B
3)
B
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