Programming instructions

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Multisim Component Reference Guide 6-36 ni.com
Sample up/down counter truth table:
6.4.65 74xx193 (Sync 4-bit Bin Up/down Counter)
This device is a synchronous, 4-bit binary, reversible up/down counter.
Sample up/down counter truth table:
INPUTS OUTPUTS
OPERATING
MODE
MR PL
CPU CPD D0 D1 D2 D3 Q0 Q1 Q2 Q3 TCUTCD
1XX 0 XXXX00001 0 Reset
1XX 1 XXXX00001 1
00X0 000000001 0 Parallel load
00X1 000000001 1
000 X 1XX1Qn=Dn 0 1
001 X 1XX1Qn=Dn 1 1
01· 1 XXXXCount up 1
1
1 Count up
011 · XXXXCount down 1 1
2
Count down
· = transition from low to high
1
1
= TCU=CPU at terminal count up (HLLH)
1
2
= TCD=CPD at terminal count down (LLLL)
INPUTS OUTPUTS
OPERATING
MODE
MR PL
CPU CPD D0 D1 D2 D3 Q0 Q1 Q2 Q3 TCUTCD
1XX 0 XXXX00001 0 Reset
1XX 1 XXXX00001 1
00X 0 000000001 0
Parallel load
00X 1 000000001 1
000 X 111111110 1
001 X 111111111 1
01· 1 XXXXCount up 1
1
1 Count up
011 · XXXXCount down 1 1
2
Count down
· = transition from low to high
1
1
=TCU=CPU at terminal count up (HHHH)
1
2
= TCD=CPD at terminal count down (LLLL)
ComponentRef.book Page 36 Thursday, December 7, 2006 10:12 AM