CS82C54 datasheet(12/17 Pages) INTERSIL

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4-12

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.

FIGURE 15. GATE PIN OPERATIONS SUMMARY

FIGURE 16. MINIMUM AND MAXIMUM INITIAL COUNTS

SIGNAL

STATUS

MODES

LOW OR

GOING LOW

RISING

HIGH

Disables Counting

Enables Counting

1) Initiates

Counting

2) Resets output

after next clock

1) Disables

counting

2) Sets output im-

mediately high

Initiates Counting Enables Counting

1) Disables

counting

2) Sets output im-

mediately high

Initiates Counting Enables Counting

1) Disables

Counting

Enables Counting

Initiates Counting

MODE

MIN COUNT

MAX COUNT

010

110

220

320

410

510

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

counting.

82C54

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