8XC251SA/SB/SP/SQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
V
P1.0 / T2
P1.1 / T2EX
P1.2 / ECI
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
1
CC
AD0 / P0.0
AD1 / P0.1
AD2 / P0.2
AD3 / P0.3
AD4 / P0.4
AD5 / P0.5
AD6 / P0.6
AD7 / P0.7
2
3
P1.3 / CEX0
P1.4 / CEX1
P1.5 / CEX2
P1.6 / CEX3 / WAIT#
P1.7 / CEX4 / A17 / WCLK
RST
4
5
8XC251SA
8XC251SB
8XC251SP
8XC251SQ
6
7
8
9
V
EA# /
P3.0 / RXD
10
11
12
13
14
15
16
17
18
19
20
PP
P3.1 / TXD
ALE / PROG#
PSEN#
P3.2 / INT0#
P3.3 / INT1#
P3.4 / T0
A15 / P2.7
A14 / P2.6
A13 / P2.5
A12 / P2.4
A11 / P2.3
A10 / P2.2
A9 / P2.1
View of
component
as mounted
on PC board
P3.5 / T1
P3.6 / WR#
P3.7 / RD# / A16
XTAL2
XTAL1
V
A8 / P2.0
SS
A4206-03
Figure 4. 8XC251SA/SB/SP/SQ 40-pin PDIP and Ceramic DIP Packages
PRELIMINARY
7
INTEL [ INTEL ]
