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CDP1878CD Datasheet(PDF) 7 Page - Intersil Corporation |
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CDP1878CD Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 13 page 4-97 Mode 2 Operation of this mode is the same as mode 1, except the outputs will change for one clock period only and then return to the condition of TXO high and TXO low, and the counter is reloaded Mode 3 After the jam register is loaded with the required value, the gate edge will initiate this mode. TXO will be set high, and TXO will be set low. The clock will decrement the counter. When zero is reached, TXO will go low and TXO will be high, and the interrupt output will be set low. The counter is retrig- gerable: While the counter is decrementing, a gate edge or write to the control register with the jam-enable bit high, will load the counter with the jam register value and restart the one-shot operation. MODE CONTROL REGISTER GATE CONTROL 2 Timeout Strobe Selectable High or Low Level Enables Operation XXXXX0 1 0 BUS 7 BUS 0 FIGURE 2. TIMEOUT STROBE (MODE 2) TIMING WAVEFORMS NOTE: Write to control register with mode selects = 0 COUNTER VALUE CLOCK WR CONTROL REGISTER GATE TXO INT 1 2 3 3 LOAD COUNT = 3 0 1 2 3 0 1 2 3 3 0 1 2 3 SEE NOTE MODE CONTROL REGISTER GATE CONTROL 3 Gate Controlled One-Shot Selectable Positive or Negative Going Edge Initiates Operation 0 XXXX0 1 1 BUS 7 BUS 0 FIGURE 3. GATE CONTROLLED ONE-SHOT (MODE 3) TIMING WAVEFORMS COUNTER VALUE CLOCK WR CONTROL REGISTER GATE TXO INT LOAD COUNT = 3 2 3 3 0 1 2 3 3 1 2 3 0 1 2 3 CDP1878C |
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