Datasheet

Page 14
Page 15
40-pin AT89S8253 schematic
Figure 6-1: Connection schematic for 40-pin AT89S8253 MCU via 2x5 male header
1
2
3
4
5
6
7
8 33
34
35
36
37
38
39
40
P1.0
P1.1
P1.2
P1.3
P1.4 (SS)
P1.5 (MOSI)
P1.6 (MISO)
P1.7 (SCK)
P0.4
P0.5
VCC
P0.0
P0.1
P0.2
P0.3
P0.6
9
10
11
12
13
14
15
16
RST
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
17
18
19
20
XTAL2
XTAL1
GND
25
26
27
28
29
30
31
32
P2.6
P2.5
P0.7
ALE/PROG
PSEN
P2.7
21
22
23
24
P2.1
P2.0
P2.2
AT89S8253
P3.7
EA/VPP
P2.4
P2.3
U1
40 pin
VCC
X1
8MHz
C1
22pF
C2
22pF
MOSI
RST
SCK
MISO
SS
VCC
C3
100nF
VCC