Remote-processing RPC-2350 Instrukcja Użytkownika Pobierz pdf (Strona 61)

MULTI-MODE COUNTER CHAPTER 14

14-6

Signal levels are all TTL logic (0 to 5V).

The following signals at J10 are used to measur e pulse

widths:

J10 pin Description

4 Counter gate. Measures when low.

7 4.608 M HZ clock output. Tie to J10-9

9 Clock input. Tie to J10-7

The LS7166 ICR register is program med so input A

(J10-9) is up count input and GATE input (J10-9) acts to

enable inputs A/B when low.

If desired, LOAD input (J10-6) can be used to reset the

counter. If this is de sired, make su re the O L register is

programmed for 0.

See the demonstration program CNTR6.BAS for a

working example.

Basic operation is a follows:

Set the counter to 0

Read the counter and wait until it stops changing

after it starts

Read the counter

Multiply result by 2.170139E-7

The result is the actual time.

J10 Pin out

The following is the pin out for J10.

J10

Function

1 Ground

2 4.608 M HZ clock output

3 Sound output

4 Gate input

5 +5V

6 Load counter

7 INT 1 input

8 B counter input

9 A counter input

10 High voltage input

COMMANDS

The following commands are used with the multi-mode

counter.

Command Function

COU NT(8) Reads multi-mode counter

ON ITR 1 Interrupt tasking

INP I/O port read

OUT Write to I/O port

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 82 83

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