Interrupt channel, Programmable timer/counter, 5 interrupt channel – Omega 1002 User Manual
Page 10: 6 programmable timer/counter
1.4.5 Interrupt Channel
• Interrupt:
INTA (Automatically assigned by PCI-controller).
• Enable/Disable: Via PCI control register and add-on control register.
• Interrupt source: (Selected by on-board control register)
1. A/D conversion interrupt
2. Pacer 0 interrupt (Timer 0)
3. Pacer 1 interrupt (Timer 1)
4. External interrupt
Figure 1-3. Programmable interrupt source.
A/D busy
IRQ
End of Conversion
1.
Pacer 0
IRQ
Falling edge of Pacer 0
2.
Pacer 1
IRQ
Falling edge of Pacer 1
3.
External
Trigger
IRQ
Falling edge of
External trigger
4.
1.4.6 Programmable Timer/Counter
• Type: 82C54-8 programmable timer/counter.
• Timers:
1. Timer 0 for Pacer trigger and interrupt
2. Timer 1 for External trigger and interrupt
3. Timer 2 for software machine independent timer
• Input Clock: 4 MHz.
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