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Motorola CMOS Logic Manual page 324

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CLOCK
UP/DOWN
CARRY IN
(MSD)
PE
P7
P6
P5
P4
P3
P2
P1
P0
CARRY OUT
(MSD)
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
CARRY OUT
(LSD)
RESET
COUNT
13
14
15
16
17
PRESET ENABLE
UP COUNT
18
19
18
17
16
15
14
13
DOWN COUNT
251
252 253 254 255
0
1
PRESET
ENABLE
UP COUNT
2
3
2
1
0
1
2
RESET
DOWN
UP COUNT
COUNT

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