Block Diagram
XTAL1
XTAL2
RAM
256x8
Parallel I/O Ports & Ext. Bus
UART
Port 0Port 1
Port 3
Port 2
ALE
C51
CORE
IB-bus
PSEN
CPU
EA
Timer 0
Timer 2
Timer 1
INT
Ctrl
RD
WR
Pin Configuration
P1.0/T2
40
1
2
VCC
39
38
P0.0/A0
P0.1/A1
P1.1/T2EX
P1.2
3
4
P1.3
37 P0.2/A2
P0.3/A3
36
P1.4
P1.5
5
6
P0.4/A4
35
6
5 4 3 2 1
44 43 42 41 40
P0.5/A5
34
P1.6
7
8
P1.5
P1.6
39
38
7
8
P0.4/AD4
P0.5/AD5
P0.6/AD6
P0.7/AD7
EA
P0.6/A6
33
32
31
30
P1.7
RST
P0.7/A7
9
P1.7
37
9
EA/VPP
ALE
P3.0/RxD 10
P3.1/TxD
RST
10
11
12
13
36
35
34
33
SB40
11
P3.0/RxD
NIC*
PSEN
12
P3.2/INT0
29
28
27
26
NIC*
MQFPJ44
P2.7/A15
P2.6/A14
P3.3/INT1 13
P3.1/TxD
P3.2/INT0
P3.3/INT1
P3.4/T0
P3.5/T1
ALE
14
15
16
P3.4/T0
P3.5/T1
P3.6/WR
14
15
16
17
32
31
30
29
PSEN
P2.5/A13
P2.7/A15
P2.6/A14
P2.5/A13
P2.4/A12
P2.3/A11
25
24
23
22
21
17
18
19
20
P3.7/RD
XTAL2
P2.2/A10
P2.1/A9
P2.0/A8
18 19 20 21 22 23 24 25 26 27 28
XTAL1
VSS
Note:
NIC: No Internal Connection
2
80C32E
4149M–AERO–06/03
AIMTEC [ AIMTEC ]
