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19 Chapter 2
2.5.3
Interrupt Function of the DI Signals
DI0 and
DI1 can be used to generate hardware
interrupts. Users can setup
the configuration of them
by
programming the interrupt control register.
The channels are connected to the interrupt circuitry.
Users can
disable/
enable interrupt
function, select trigger
type or
latch the port data
by
set-
ting
the Interrupt Control Register of the
UNO-3074 (refer to section 2.5.5
below). When
the interrupt request
signals occur,
then the software will
service
these
interrupt requests by
ISR (Interrupt Service
Routine). The
multiple
interrupt sources provide
the
card with more
capability and flexi-
bility.
2.5.4
IRQ Level
The IRQ level is by default set by the system BIOS. IRQ 7 is reserved for
DI
interrupt and counter
interrupt.
2.5.5
Interrupt Control Register
The Interrupt Control
Register
controls the function and status of
each
interrupt
signal source. Table
2.5 shows
the
bit map
of the Interrupt
Con-
trol Register. The register is
readable/writeable register. While
being writ-
ten, it
is used as
a control
register;
and
while being read, it is used as
a sta-
tus register.
DI0EN & DI1EN: DI0 & DI1
Interrupt
disable/enable control
bit
DI0TE & DI1TE: DI0 & DI1 Interrupt triggering edge control
bit
DI0F & DI1F:
DI0 &
DI1 interrupt
flag bit
Table 2.5: Interrupt Control Register Bit Map
Base Address 7 6 5 4 3 2 1 0
202H R/W Interrupt Enable Control/Status Register
DI1EN DI0EN
203H R/W Interrupt Triggering Edge Control/Status Register
DI1TE DI0TE
207H R/W Interrupt Flag/Clear Register
DI1F DI0F