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2. Pin Configuration
2.1
20-lead PDIP/SOIC
3. Block Diagram
AT89C2051
2
RST/VPP
1
20
VCC
(RXD) P3.0
2
19
P1.7
(TXD) P3.1
3
18
P1.6
XTAL2
4
17
P1.5
XTAL1
5
16
P1.4
(INT0) P3.2
6
15
P1.3
(INT1) P3.3
7
14
P1.2
(TO) P3.4
8
13
P1.1 (AIN1)
(T1) P3.5
9
12
P1.0 (AIN0)
GND
10
11
P3.7
0368G–MICRO–6/05
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