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82C54 Datasheet(PDF) 10 Page - Intel Corporation |
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82C54 Datasheet(HTML) 10 Page - Intel Corporation |
10 / 18 page 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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