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