84065013A データシートの表示（PDF） - Intersil

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84065013A

CMOS Programmable Interval Timer

Intersil 

82C54

Counter

New counts are loaded and Counters are decremented on

the falling edge of CLK.

The largest possible initial count is 0; this is equivalent to 216

for binary counting and 104 for BCD counting.

The counter does not stop when it reaches zero. In Modes 0,

1, 4, and 5 the Counter “wraps around” to the highest count,

either FFFF hex for binary counting or 9999 for BCD count-

ing, and continues counting. Modes 2 and 3 are periodic; the

Counter reloads itself with the initial count and continues

counting from there.

SIGNAL

STATUS

MODES

LOW OR

GOING LOW

RISING

HIGH

0 Disables Counting

-

Enables Counting

1

-

1) Initiates

-

Counting

2) Resets output

after next clock

2 1) Disables

Initiates Counting Enables Counting

counting

2) Sets output im-

mediately high

3 1) Disables

Initiates Counting Enables Counting

counting

2) Sets output im-

mediately high

4 1) Disables

Counting

-

Enables Counting

5

-

Initiates Counting

-

MODE

MIN COUNT

MAX COUNT

0

1

0

1

1

0

2

2

0

3

2

0

4

1

0

5

1

0

NOTE: 0 is equivalent to 216 for binary counting and 104 for BCD

counting.

FIGURE 16. MINIMUM AND MAXIMUM INITIAL COUNTS

FIGURE 15. GATE PIN OPERATIONS SUMMARY

4-12

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