AT89C52内部寄存器一览表
|
AT89C52内部寄存器一览表
|
|
通用寄存器
|
|
地址
|
名称
|
位地址
|
|
00H - 07H
|
寄存器组0
|
R7
|
R6
|
R5
|
R4
|
R3
|
R2
|
R1
|
R0
|
|
08H – 0FH
|
寄存器组1
|
R7
|
R6
|
R5
|
R4
|
R3
|
R2
|
R1
|
R0
|
|
10H – 17H
|
寄存器组2
|
R7
|
R6
|
R5
|
R4
|
R3
|
R2
|
R1
|
R0
|
|
18H – 1FH
|
寄存器组3
|
R7
|
R6
|
R5
|
R4
|
R3
|
R2
|
R1
|
R0
|
|
20H
:
2FH
|
通用寄存器
16个字节
可位寻址
|
00H
|
01H
|
02H
|
03H
|
04H
|
05H
|
06H
|
07H
|
|
:
|
:
|
:
|
:
|
:
|
:
|
:
|
:
|
|
78H
|
79H
|
7A
|
7B
|
7C
|
7D
|
7EH
|
7FH
|
|
30H
:
7FH
|
通用寄存器
79个字节
|
|
|
|
|
|
|
80H
：
FFH
|
通用寄存器
128个字节
用间接寻址
|
|
|
|
|
|
|
特殊功能寄存器
|
|
地址
|
标记
|
名称
|
D7
|
D6
|
D5
|
D4
|
D3
|
D2
|
D1
|
D0
|
|
80H
|
P0
|
P0口锁存器
|
87H
|
86H
|
85H
|
84H
|
83H
|
82H
|
81H
|
80H
|
|
P0.7
|
P0.6
|
P0.5
|
P0.4
|
P0.3
|
P0.2
|
P0.1
|
P0.0
|
|
81H
|
SP
|
|
00000111B
|
|
82H
|
DPL
|
|
|
|
83H
|
DPH
|
|
|
|
87H
|
PCON
|
|
|
|
|
|
|
|
|
|
|
88H
|
TCON
|
定时/
计数器控制寄存器
|
8FH
|
8EH
|
8DH
|
8CH
|
8BH
|
8AH
|
89FH
|
88H
|
|
TF1
|
TR1
|
TF0
|
TR0
|
IE1
|
IT1
|
IE0
|
IT0
|
|
89H
|
TMOD
|
|
|
|
|
|
|
|
|
|
|
8AH
|
TL0
|
|
|
|
8BH
|
TL1
|
|
|
|
8CH
|
TH0
|
|
|
|
8DH
|
TH1
|
|
|
|
90H
|
P1
|
P1口锁存器
|
97H
|
96H
|
95H
|
94H
|
93H
|
92H
|
91H
|
90H
|
|
P1.7
|
P1.6
|
P1.5
|
P1.4
|
P1.3
|
P1.2
|
P1.1
|
P1.0
|
|
98H
|
SCON
|
串行口控制寄存器
|
9FH
|
9EH
|
9DH
|
9CH
|
9BH
|
9AH
|
99FH
|
98H
|
|
SM0
|
SM1
|
SM2
|
REN
|
TB8
|
RB8
|
T1
|
R1
|
|
99H
|
SBUF
|
|
|
|
|
|
|
|
|
|
|
A0H
|
P2
|
P2口锁存器
|
A7H
|
A6H
|
A5H
|
A4H
|
A3H
|
A2H
|
A1H
|
A0H
|
|
P2.7
|
P2.6
|
P2.5
|
P2.4
|
P2.3
|
P2.2
|
P2.1
|
P2.0
|
|
A8H
|
IE
|
中断允许寄存器
|
AFH
|
-
|
-
|
ACH
|
ABH
|
AAH
|
A9H
|
A8H
|
|
EA
|
-
|
-
|
ES
|
ET1
|
EX1
|
ET0
|
EX0
|
|
B0H
|
P3
|
P3锁存器
|
B7H
|
B6H
|
B5H
|
B4H
|
B3H
|
B2H
|
B1H
|
B0H
|
|
P3.7
|
P3.6
|
P3.5
|
P3.4
|
P3.3
|
P3.2
|
P3.1
|
P3.0
|
|
B8H
|
IP
|
中断优先级寄存器
|
-
|
-
|
-
|
-
|
BBH
|
BAH
|
B9H
|
B8H
|
|
-
|
-
|
-
|
-
|
PT1
|
PX1
|
PT0
|
PX0
|
|
C8H
|
T2CON
|
定时/计数器2控制寄存器
|
CFH
|
CEH
|
CDH
|
CCH
|
CBH
|
CAH
|
C9H
|
C8H
|
|
TF2
|
EXF2
|
RCLK
|
TCLK
|
EXEN2
|
TR2
|
C/T2
|
CP/RL2
|
|
C9H
|
T2MOD
|
|
-
|
-
|
-
|
-
|
-
|
-
|
T2OE
|
DCEN
|
|
CAH
|
RCAP2L
|
|
|
|
CBH
|
RCAP2H
|
|
|
|
CCH
|
TL2
|
|
|
|
CDH
|
TH2
|
|
|
|
D0H
|
PSW
|
程序状态寄存器
|
D7H
|
D6H
|
D5H
|
D4H
|
D3H
|
D2H
|
D1H
|
D0H
|
|
CY
|
AC
|
F0
|
RS1
|
RS0
|
OV
|
D1
|
P/D0
|
|
E0H
|
ACC
|
累加器
|
E7H
|
E6H
|
E5H
|
E4H
|
E3H
|
E2H
|
E1H
|
E0H
|
|
ACC.7
|
ACC.6
|
ACC.5
|
ACC.4
|
ACC.3
|
ACC.2
|
ACC.1
|
ACC.0
|
|
F0H
|
B
|
B寄存器
|
F7H
|
F6H
|
F5H
|
F4H
|
F3H
|
F2H
|
F1H
|
F0H
|
|
B.7
|
B.6
|
B.5
|
B.4
|
B.3
|
B.2
|
B.1
|
B.0
|
|
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