
Semiconductor Group 3 - 8
Memory Organization
Table 3-1, Special Function Register
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
Block Symbol Name Address Contents after
Reset
Ports P0
P1
P2
P3
P4
P5
P6
P7
P8
Port 0
Port 1
Port 2
Port 3
Port 4
Port 5
Port 6
Port 7, Analog/Digital Input
Port 8, Analog/Digital Input, 4-bit
80
H
1)
90
H
1)
A0
H
1)
B0
H
1)
E8
H
1)
F8
H
1)
FA
H
DB
H
DD
H
FF
H
FF
H
FF
H
FF
H
FF
H
FF
H
FF
H
–
–
Pow. Save
Modes
PCON Power Control Register 87H 00
H
Serial
Channels
ADCON0
2)
PCON
2)
S0BUF
S0CON
S0RELL
S0RELH
S1BUF
S1CON
S1RELL
S1RELH
A/D Converter Control Reg.
Power Control Register
Serial Channel 0 Buffer Reg.
Serial Channel 0 Control Reg.
Serial Channel 0 Reload Reg., low byte
Serial Channel 0 Reload Reg., high byte
Serial Channel 1 Buffer Reg.
Serial Channel 1 Control Reg.
Serial Channel 1 Reload Reg., low byte
Serial Channel 1 Reload Reg., high byte
D8
H
1)
87
H
99
H
98
H
1)
0AA
H
BA
H
9C
H
9B
H
9D
H
BB
H
00
H
00
H
XX
H
00
H
D9
H
XXXX XX11
B
3)
XX
H
3)
0X00 0000
B
3)
00
H
XXXX XX11
B
3)
Timer 0/
Timer 1
TCON
TH0
TH1
TL0
TL1
TMOD
Timer Control Register
Timer 0, High Byte
Timer 1, High Byte
Timer 0, Low Byte
Timer 1, Low Byte
Timer Mode Register
88
H
1)
8C
H
8D
H
8A
H
8B
H
89
H
00
H
00
H
00
H
00
H
00
H
00
H
Watchdog IEN0
2)
IEN1
2)
IP0
2)
IP1
2)
WDTREL
Interrupt Enable Register 0
Interrupt Enable Register 1
Interrupt Priority Register 0
Interrupt Priority Register 1
Watchdog Timer Reload Reg.
A8
H
1)
B8
H
1)
A9
H
B9
H
86
H
00
H
00
H
00
H
XX00 0000
B
3)
00
H
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