82C54 datasheet(10/18 Pages) INTEL

Part #	82C54

Description	CHMOS PROGRAMMABLE INTERVAL TIMER

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Manufacturer	INTEL [Intel Corporation]

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82C54

If an initial count is written while GATE e 0 it will

still be loaded on the next CLK pulse When GATE

goes high OUT will go high N CLK pulses later no

CLK pulse is needed to load the Counter as this has

already been done

231244 – 8

NOTE

The Following Conventions Apply To All Mode Timing

Diagrams

1

Counters are programmed for binary (not BCD)

counting and for ReadingWriting least significant byte

(LSB) only

2 The counter is always selected (CS always low)

3 CW stands for ‘‘Control Word’’ CW e 10 means a

control word of 10 hex is written to the counter

4 LSB stands for ‘‘Least Significant Byte’’ of count

5 Numbers below diagrams are count values

The lower number is the least significant byte

The upper number is the most significant byte Since

the counter is programmed to ReadWrite LSB only

the most significant byte cannot be read

N stands for an undefined count

Vertical lines show transitions between count values

Figure 15 Mode 0

MODE 1 HARDWARE RETRIGGERABLE

ONE-SHOT

OUT will be initially high OUT will go low on the CLK

pulse following a trigger to begin the one-shot pulse

and will remain low until the Counter reaches zero

OUT will then go high and remain high until the CLK

pulse after the next trigger

After writing the Control Word and initial count the

Counter is armed A trigger results in loading the

Counter and setting OUT low on the next CLK pulse

thus starting the one-shot pulse An initial count of N

will result in a one-shot pulse N CLK cycles in dura-

tion The one-shot is retriggerable hence OUT will

remain low for N CLK pulses after any trigger The

one-shot pulse can be repeated without rewriting the

same count into the counter GATE has no effect on

OUT

If a new count is written to the Counter during a one-

shot pulse the current one-shot is not affected un-

less the Counter is retriggered In that case the

Counter is loaded with the new count and the one-

shot pulse continues until the new count expires

231244 – 9

Figure 16 Mode 1

10

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