Table 6-2. The Standard 80C51 SFRs
SYMBOL
DESCRIPTION
ADDR
E0H
F0H
D0H
81H
83H
82H
80H
90H
A0H
B0H
B8H
A8H
89H
88H
C8H
8CH
8AH
8DH
8BH
CDH
CCH
CBH
CAH
98H
99H
87H
9FH
SM0/FE
9EH
SM1
9DH
SM2
9CH
REN
9BH
TB8
9AH
RB8
99H
TI
98H
RI
87H
P0.7
97H
P1.7
A7H
P2.7
B7H
P3.7
BFH
-
AFH
EA
86H
P0.6
96H
P1.6
A6H
P2.6
B6H
P3.6
BEH
-
AEH
-
85H
P0.5
95H
P1.5
A5H
P2.5
B5H
P3.5
BDH
PT2
ADH
ET2
84H
P0.4
94H
P1.4
A4H
P2.4
B4H
P3.4
BCH
PS
ACH
ES
83H
P0.3
93H
P1.3
A3H
P2.3
B3H
P3.3
BBH
PT1
ABH
ET1
82H
P0.2
92H
P1.2
A2H
P2.2
B2H
P3.2
BAH
PX1
AAH
EX1
81H
P0.1
91H
P1.1
A1H
P2.1
B1H
P3.1
B9H
PT0
A9H
ET0
80H
P0.0
90H
P1.0
A0H
P2.0
B0H
P3.0
B8H
PX0
A8H
EX0
BIT ADDRESS & SYMBOL
ACC
*
B
*
PSW
*
SP
DPH
DPL
P0
*
P1
*
P2
*
P3
*
IP
*
IE
*
TMOD
TCON
*
Accumulator
B Register
Program Status Word
Stack Pointer
Data Pointer High
Data Pointer Low
Port 0
Port 1
Port 2
Port 3
Interrupt Priority
Interrupt Enable
Timer Mode
Timer Control
Bit-7
E7H
ACC.7
F7H
B.7
D7H
CY
Bit-6
E6H
ACC.6
F6H
B.6
D6H
AC
Bit-5
E5H
ACC.5
F5H
B.5
D5H
F0
Bit-4
E4H
ACC.4
F4H
B.4
D4H
RS1
Bit-3
E3H
ACC.3
F3H
B.3
D3H
RS0
Bit-2
E2H
ACC.2
F2H
B.2
D2H
OV
Bit-1
E1H
ACC.1
F1H
B.1
D1H
-
Bit-0
E0H
ACC.0
F0H
B.0
D0H
P
RESET
VALUE
00H
00H
00H
07H
00H
00H
FFH
FFH
FFH
FFH
00H
00H
00H
00H
00H
00H
00H
00H
00H
00H
00H
00H
00H
00H
xxH
GATE
8FH
TF1
CFH
TF2
C/-T
8EH
TR1
CEH
EXF2
M1
8DH
TF0
CDH
RCLK
M0
8CH
TR0
CCH
TCLK
GATE
8BH
IE1
CBH
EXEN2
C/-T
8AH
IT1
CAH
TR2
M1
89H
IE0
C9H
C/-T2
M0
88H
IT0
C8H
CP/-RL2
T2CON
*
Timer 2 Control
TH0
TL0
TH1
TL1
TH2
TL2
Timer 0, High-byte
Timer 0, Low-byte
Timer 1, High-byte
Timer 1, Low-byte
Timer 2, High-byte
Timer 2, Low-byte
RCAP2H Timer 2 Capture, High
RCAP2L Timer 2 Capture, Low
SCON
*
SBUF
PCON
Serial Port Control
Serial Data Buffer
Power Control
SMOD
SMOD0
-
POF
GF1
GF0
PD
IDL
10H
#
Notes:
*: Bit addressable
-: Reserved bit
#
: Reset value depends on reset source.
MEGAWIN
MPC82G516A Data Sheet
26
MEGAWIN [ MEGAWIN TECHNOLOGY CO., LTD ]
