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CS82C54-10 Datasheet(PDF) 11 Page - Intersil Corporation |
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CS82C54-10 Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 22 page 11 82C54 MODE DEFINITIONS The following are defined for use in describing the operation of the 82C54. CLK PULSE - A rising edge, then a falling edge, in that order, of a Counter’s CLK input. TRIGGER - A rising edge of a Counter’s Gate input. COUNTER LOADING - The transfer of a count from the CR to the CE (See “Functional Description”) MODE 0: INTERRUPT ON TERMINAL COUNT Mode 0 is typically used for event counting. After the Control Word is written, OUT is initially low, and will remain low until the Counter reaches zero. OUT then goes high and remains high until a new count or a new Mode 0 Control Word is written to the Counter. GATE = 1 enables counting; GATE = 0 disables counting. GATE has no effect on OUT. After the Control Word and initial count are written to a Counter, the initial count will be loaded on the next CLK pulse. This CLK pulse does not decrement the count, so for an initial count of N, OUT does not go high until N + 1 CLK pulses after the initial count is written. If a new count is written to the Counter it will be loaded on the next CLK pulse and counting will continue from the new count. If a two-byte count is written, the following happens: 1. Writing the first byte disables counting. Out is set low immediately (no clock pulse required). 2. Writing the second byte allows the new count to be loaded on the next CLK pulse. This allows the counting sequence to be synchronized by software. Again OUT does not go high until N + 1 CLK pulses after the new count of N is written. COMMANDS DESCRIPTION RESULT D7 D6 D5 D4 D3 D2 D1 D0 1 1 0 0 0 0 1 0 Read-Back Count and Status of Counter 0 Count and Status Latched for Counter 0 1 1 1 0 0 1 0 0 Read-Back Status of Counter 1 Status Latched for Counter 1 1 1 1 0 1 1 0 0 Read-Back Status of Counters 2, 1 Status Latched for Counter 2, But Not Counter 1 1 1 0 1 1 0 0 0 Read-Back Count of Counter 2 Count Latched for Counter 2 1 1 0 0 0 1 0 0 Read-Back Count and Status of Counter 1 Count Latched for Counter 1, But Not Status 1 1 1 0 0 0 1 0 Read-Back Status of Counter 1 Command Ignored, Status Already Latched for Counter 1 FIGURE 7. READ-BACK COMMAND EXAMPLE CS RD WR A1 A0 01000 Write into Counter 0 01001 Write into Counter 1 01010 Write into Counter 2 01011 Write Control Word 00100 Read from Counter 0 00101 Read from Counter 1 00110 Read from Counter 2 00111 No-Operation (Three-State) 1 XXXX No-Operation (Three-State) 0 1 1 X X No-Operation (Three-State) FIGURE 8. READ/WRITE OPERATIONS SUMMARY |
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Descripción similar - CS82C54-10 |
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