Intel 8XC251SA - Manual (Page 6)

6
PRELIMINARY
8XC251SA/SB/SP/SQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER
2.0 PINOUT
Figure 3. 8XC251SA/SB/SP/SQ 44-pin PLCC Package
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
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
A4205-02
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
39
38
37
36
35
34
33
32
31
30
29
8XC251SA
8XC251SB
8XC251SP
8XC251SQ
View of component as
mounted on PC board
7
8
9
10
11
12
13
14
15
16
17
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
18 19 20 21 22 23 24 25 26 27 28
6 5 4 3 2 1
44 43 42 41 40