debugger-at89c51

A
B
8051 in circuit debugger based on AT89C51
Chin-Shiuh Shieh 1999/11/21
11.0592M
20p
74373
1
2
3
4
5
6
7
8
9
10
/OC
1Q
1D
2D
2Q
3Q
3D
4D
4Q
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
+5V
20
19
18
17
16
15
14
13
12
11
Vcc
8Q
8D
7D
7Q
6Q
6D
5D
5Q
CK
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
I/O0
I/O1
I/O2
Vss
Vcc
/WE
A13
A8
A9
A11
/OE
A10
/CS
I/O7
I/O6
I/O5
I/O4
I/O3
+5V
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
In Circuit Socket
20p
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
3
62256
P1.0
VCC
P1.1
P0.0(AD0)
P1.2
P0.1(AD1)
P1.3
P0.2(AD2)
P1.4
P0.3(AD3)
P1.5
P0.4(AD4)
P1.6
P0.5(AD5)
P1.7
P0.6(AD6)
RST
P0.7(AD7)
P3.0(RXD) /EA(VPP)
P3.1(TXD)ALE(/PROG)
P3.2(/INT0)
/PSEN
P3.3(/INT1) P2.7(A15)
P3.4(T0)
P2.6(A14)
P3.5(T1)
P2.5(A13)
P3.6(/WR) P2.4(A12)
P3.7(/RD) P2.3(A11)
XTAL2
P2.2(A10)
XTAL1
P2.1(A9)
GND
P2.0(A8)
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
7408AND
1
2
3
4
5
6
7
1A Vcc
1B 4A
1Y 4B
2A 4Y
2B 3A
2Y 3B
GND3Y
+5V
14
13
12
11
10
9
8
1u
1u
1u
1
2
3
4
5
6
7
8
Vout = 5V DC
7805
IN OUT
GND
3
Power Link
HIN232
1u
+5V
Vin > 7V DC
330
2
+5V
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
330
8.2k
RESET
P1.0
VCC
P1.1
P0.0(AD0)
P1.2
P0.1(AD1)
P1.3
P0.2(AD2)
P1.4
P0.3(AD3)
P1.5
P0.4(AD4)
P1.6
P0.5(AD5)
P1.7
P0.6(AD6)
RST
P0.7(AD7)
P3.0(RXD) /EA(VPP)
P3.1(TXD)ALE(/PROG)
P3.2(/INT0)
/PSEN
P3.3(/INT1) P2.7(A15)
P3.4(T0)
P2.6(A14)
P3.5(T1)
P2.5(A13)
P3.6(/WR) P2.4(A12)
P3.7(/RD) P2.3(A11)
XTAL2
P2.2(A10)
XTAL1
P2.1(A9)
GND
P2.0(A8)
E
10u
10u
+5V
AT89C51
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
D
100u
1
C
C1+
Vcc
V+
GND
C1- T1out
C2+
R1in
C2- R1out
VT1in
T2out T2in
R2in R2out
+5V
16
15
14
13
12
11
10
9
RS232
Connector
1
2
3
4
5
CD
DSR 6
RD
RTS 7
TD
CTS 8
DTR
RI 9
GND
4
4
A
B
C
D
E