Programming instructions

CMOS
Multisim Component Reference Guide 7-42 ni.com
Binary counter truth table:
7.2.81 4522 (4-bit BCD Down Counter)
The 4522 device is a synchronous programmable 4-bit BCD down counter with an active
HIGH and an active LOW clock input (CP0, CP1), an asynchronous parallel load input (PL),
four parallel inputs (P0 to P3), a cascade feedback input (CF), four buffered parallel outputs
(O0 to O3), a terminal count output (TC) and an overriding asynchronous master reset input
(MR).
CP0 CP1 MR MODE
· 1 0 COUNTER ADVANCES
0 ‚ 0 COUNTER ADVANCES
‚ X 0 NO CHANGE
X · 0 NO CHANGE
· 0 0 NO CHANGE
1 ‚ 0 NO CHANGE
X X 1 O0 TO O3 = LOW
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