19
Chapter 3
3.3.2 Interrupt Source Control
The "mode bits" in the interrupt control register determine the allowable
sources of signals generating an interrupt. Bit 0 and bit 1 determine the
interrupt source, as indicated in Figure 3-1. Table 3-3 shows the relation-
ship between an interrupt source and the values in the mode bits.
Figure 3.1: Interrupt Sources
3.3.3 Interrupt Triggering Edge Control
The interrupt can be triggered by a rising edge or a falling edge of the
interrupt signal, selectable by the value written in the "triggering edge
control" bit in the interrupt control register, as shown in Table 3.4.
Table 3.3: Interrupt Mode Bit Values
M1
M0
Description
0
0
Disable interrupt
0
1
Source = PC00
1
0
Source = PC00 & PC04
1
1
No used
Table 3.4: Triggering Edge Control Bit Values
E
Triggering edge of interrupt signal
1
Rising edge trigger
0
Falling edge trigger
Summary of Contents for PCI-1757UP
Page 1: ...PCI 1757UP 24 channel Digital Input Output Low Profile Universal PCI Card User Manual...
Page 6: ...PCI 1757UP User Manual vi...
Page 11: ...5 Chapter1...
Page 12: ...PCI 1757UP User Manual 6...
Page 15: ...9 Chapter2 Figure 2 1 Locations of Connectors and Jumpers...
Page 27: ...2 APPENDIX A Register Format...
