Appendix
AT89C5131A Starter Kit Hardware User Guide
4-13
4245A–USB–11/04
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
BP1
P3_3
P3_4
Buzzer
A16
P1_7
P1_6
P1_5
P1_4
P1_0
P1_1
P1_2
P1_3
P3_0
P3_1
P3_2
P3_3
P3_4
P3_5
_W
R
_RD
_RST
_
G
Buzzer
BP1
Vss
Vss
Vcc_
C
P
U
Vss
TWI_sof
t_scl
TWI_s
oft_sda
_EA
A16
Vss
Vss
X
T
AL2
4
.35_12V
4
.35_12V
Vss
_PSEN
ALE
Vss
Keyb_0
P1_0
Keyb_1
P1_1
Keyb_2
P1_2
Keyb_3
P1_3
Keyb_4
P1_4
Keyb_6
P1_6
Keyb_5
P1_5
Keyb_7
P1_7
Vss
Vss
P0_0
P0_1
P0_2
P0_3
P0_4
P0_5
P0_6
P0_7
P2_0
P2_1
P2_2
P2_3
P2_4
P2_5
P2_6
P2_7
P4_0
P4_1
P1_0
P1_1
P1_2
P1_3
P1_4
P1_5
P1_6
P1_7
P3_1
P3_2
P3_3
P3_4
P3_5
P3_6
P3_7
P3_0
_RST
_
G
Vss
Vss
Vcc
Vss
G
e
neric_SDA
G
e
n
eric_SCL
_EA
Vss
Vss
XTAL2
_
G
_
PSEN
ALE
Vss
Vss
Vss
4
.35_12V
4
.35_12V
Vss
P4_0
P4_1
P0_0
P0_1
P0_2
P0_3
P0_4
P0_5
P0_6
P0_7
P2_0
P2_1
P2_2
P2_3
P2_4
P2_5
P2_6
P2_7
T
itle
S
iz
e
D
o
cument Number
R
e
v
Date:
S
heet
of
1
1
.0.2
AT89C5131 Evab_1.0.2 - C51 Generic
Board Connectors
A
24
Frida
y
,
October 25, 2002
J6
H
E
A
DER 24X2
C51 Generic
Right
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
C
T
7
CONTACT
1
2
JP1
A16_Buzz Jumpe
r
1
1
2
2
3
3
J5
H
E
A
DER 24X2
C51 G
eneric Left
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47