8XC251SA/SB/SP/SQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
2.0
PINOUT
P1.5 / CEX2
P1.6 / CEX3 / WAIT#
P1.7 / CEX4 / A17 / WCLK
RST
P3.0 / RXD
V
CC2
P3.1 / TXD
P3.2 / INT0#
P3.3 / INT1#
P3.4 / T0
P3.5 / T1
7
8
9
10
11
12
13
14
15
16
17
6
5
4
3
2
1
44
43
42
41
40
P1.4 / CEX1
P1.3 / CEX0
P1.2 / ECI
P1.1 / T2EX
P1.0 / T2
V
SS1
V
CC
AD0 / P0.0
AD1 / P0.1
AD2 / P0.2
AD3 / P0.3
8XC251SA
8XC251SB
8XC251SP
8XC251SQ
View of component as
mounted on PC board
18
19
20
21
22
23
24
25
26
27
28
39
38
37
36
35
34
33
32
31
30
29
AD4 / P0.4
AD5 / P0.5
AD6 / P0.6
AD7 / P0.7
EA# / V
PP
V
SS2
ALE / PROG#
PSEN#
A15 / P2.7
A14 / P2.6
A13 / P2.5
P3.6 / WR#
P3.7 / RD# / A16
XTAL2
XTAL1
V
SS
V
SS2
A8 / P2.0
A9 / P2.1
A10 / P2.2
A11 / P2.3
A12 / P2.4
A4205-02
Figure 3. 8XC251SA/SB/SP/SQ 44-pin PLCC Package
6
PRELIMINARY
INTEL [ INTEL CORPORATION ]
