1.4.5 Interrupt Channel
•
Interrupt: INTA (Automatically assigned by PCI-initiator).
•
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: Timer 0 for Pacer trigger and interrupt.
•
Timer 1 for External trigger and interrupt.
•
Timer 2 for software machine independent timer.
•
Input Clock: 4 M Hz.
PCI-1002 User’s Manual (Ver. 2.4, Mar./2004, PPH-015-24) ---- 9
