Decade Counter 1820-0055; Example Rom Programming For The Equation - HP 5340A Operating And Service Manual

Model 5340A
Theory of Operation
Table 4-1. Example ROM Programming for the Equation Y
X
(decimal)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
4-12. The programs for the ROM's used in the 5340A are given next to the schematic where they
are used. See Section VIII

4-13. Decade Counter 1820-0055

4-14. The logic diagram, oukline drawing, and truth table for this decade counter are shown in
Figure 4-4. The unit consists of four dual-rank, master-slave flip-flops that are connected
internally to provide a +5 coun,ter and a +2 counter. Gated direct reset lines are provided to inhibit
count inputs and return al1,putputs to logic 0 or BCD 9. The R O inputs at pins 2 and 3 reset the
decades zero and the R9 inputs at pins 6 and 7 reset the decades to nine. When the
to
is externally connected to the A output, the unit operates
output connected to the A input, +10 operation is obtained.
4-4
(binary)
00000
00001
00010
0001 1
00100
00101
00110
00111
01000
01001
01010
01011
01100
01 101
01110
01111
10000
10001
10010
10011
10100
10101
10110
10111
11000
11001
11010
11011
11100
11101
11110
11111
schematics.
X
2
=
(decimal) (binary)
1 0000 0001
0000 0011
3
5 0000 0101
7 0000 0111
0000 1001
9
0000 1011
11
13 0000 1101
0000 1111
15
0001 0001
17
0001 0011
19
0001 0101
21
0001 0111
23
0001 1001
25
27 0001 1011
0001 1101
29
31 0001 1111
0010 0001
33
35 0010 0011
0010 0101
37
39 0010 0111
0010 1001
41
0010 1011
43
45 0010 1101
47 0010 1111
0011 0001
49
51 0011 0011
0011 0101
53
0011 0111
55
0011 1001
57
0011 1011
59
0011 1101
61
63 0011 1111
BCD
as a decade counter.
BD input
With the D