Advantech PCI-1731 Instrukcja Użytkownika Pobierz pdf (Strona 39)

Chapter 4

– 32 –PCI-1752/54/56 User’s Manual

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Latch Port Data Function

The function enables you to latch the last data of each associated

digital input channels when the interrupt occurs and you can free the

latch function by clearing interrupt. We have organized every 16 bits

into one group. When the Latch Port Data Function is enabled for a

specific group, the values of all channel ports in this group will be

latched. The function is determined by the value in the latch port data

disable/enable control bit in the interrupt control register, as shown in

Table 4-2.

Table 4-2 Latch port data disable/enable control bit

Interrupt Enable Control Function

The user can choose to enable or disable the interrupt function by

writing its corresponding value to the interrupt disable/enable

control bit in the interrupt control register, as shown in Table 4-3.

Table 4-3 Interrupt disable/enable control bit values

Interrupt Triggering Edge Control

The interrupt can be triggered by a rising edge or a falling edge of the

interrupt signal, as determined by the value in the interrupt triggering

edge control bit in the interrupt control register, as shown in Table 4-4.

Table 4-4 Interrupt triggering edge control bit values

Ln/E Latch port data whe n the inte rrupt occurs

Disable

Enable

INTn/E Interrupt control

Disable

Enable

En Triggering edge of interrupt signal

Falling edge trigger

Rising edge trigger

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 61 62

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