M80C85 데이터 시트보기 (PDF) - Oki Electric Industry

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M80C85

CMOS PROGRAMMABLE INTERVAL TIMER

Oki Electric Industry 

¡ Semiconductor

MSM82C53-2RS/GS/JS

• Mode 4 (software trigger strobe)

The counter output is switched to “H” level by the mode setting. Counting is started in the

same way as described for mode 0. A single “L” pulse equivalent to one clock width is

generated at the counter output when the terminal count is reached.

This mode differs from 2 in that the “L” level output appears one clock earlier in mode 2, and

that pulses are not repeated in mode 4. Counting is stopped when the gate input is switched

to “L” level, and restarted from the set count value when switched back to “H” level.

• Mode 5 (hardware trigger strobe)

The counter output is switched to “H” level by the mode setting. Counting is started, and the

gate input used, in the same way as in mode 1.

The counter output is identical to the mode 4 output.

The various roles of the gate input signals in the above modes are summarized in the following

table.

Gate

Mode

0

1

2

3

4

5

"L" Level Falling Edge

Counting not possible

(1) Counting not possible

(2) Counter output forced to "H" level

(1) Counting not possible

(2) Counter output forced to "H" level

Counting not possible

Rising Edge

(1) Start of counting

(2) Retriggering

Start of counting

Start of counting

(1) Start of counting

(2) Retriggering

"H" Level

Counting possible

Counting possible

Counting possible

Counting possible

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