M80C85A/M80C85A-2 データシートの表示（PDF） - Oki Electric Industry

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M80C85A/M80C85A-2

CMOS PROGRAMMABLE INTERVAL TIMER

Oki Electric Industry 

¡ Semiconductor

MSM82C53-2RS/GS/JS

• Example of control word and count value setting

Counter #0: Read/Load LSB only, Mode 3, Binary count, count value 3H

Counter #1: Read/Load MSB only, Mode 5, Binary count, count value AA00H

Counter #2: Read/Load LSB and MSB, Mode 0, BCD count, count value 1234

MVI A, 1EH

OUT n3

MVI A, 6AH

OUT n3

MVI A, B1H

OUT n3

MVI A, 03H

OUT n0

MVI A, AAH

OUT n1

MVI A, 34H

OUT n2

MVI A, 12H

OUT n2

Counter #0 control word setting

Counter #1 control word setting

Counter #2 control word setting

Counter #0 control value setting

Counter #1 control value setting

Counter #2 count value setting (LSB then MSB)

Notes: n0: Counter #0 address

n1: Counter #1 address

n2: Counter #2 address

n3: Control word register address

• The minimum and maximum count values which can be counted in each mode are listed

below.

Mode

0

1

2

3

4

5

MIn.

1

1

2

2

1

1

Max,

0

0

0

1

0

0

Remarks

0 executes 10000H count (ditto in other modes)

—

1 cannot be counted

1 executes 10001H count

—

—

10/19

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