Flag Pins; Interrupt Pins - Analog Devices ADSP-21160 EZ-KIT Lite Manual

Flag Pins

The ADSP-21160 processor holds four general-purpose programmable
flag pins. The flag pins can be used as inputs or output depending on how
they are configured in the
written to and read from the
are input, their current state can be found by reading the
register. Flag pins set as outputs are driven to the value written to the
system register.
FLAGS
The locations of the signals can be found in
Schematic" on page
more information on flags, refer to the ADSP-21160 SHARC Processor
Hardware Reference
Table 1-2. Flag Pin Summary
1
Flag Pin
FLAG0
FLAG1
FLAG2
FLAG3
1 are available on connector
FLAG3–0

Interrupt Pins

The ADSP-21160 processor holds three interrupt request (
let you interact with the running program. The
as inputs. To use the pins, enable the specific IRQ, as well as enable the
global interrupts. You also need to write a special interrupt service routine
to handle the interrupts when they occur.
ADSP-21160 EZ-KIT Lite Evaluation System Manual
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system register. The state of a flag can be
MODE2
FLAGS
B-1. The flag pins are summarized in
Connects To
LED3
LED2
LED1
AD1881A
RESET
.
P2
Using ADSP-21160 EZ-KIT Lite
system registers. When the flag pins
"ADSP-21160 EZ-KIT Lite
Description
connect to the LEDs. These can be
FLAG2–0
used, for example, to light a LED when a rou-
tine completes.
connects directly to the reset pin of the
FLAG3
AD1881A audio codec. To reset the AD1881A,
drive this signal low.
pins can be used only
~IRQ
system
FLAGS
Table 1-2. For
) pins that
~IRQ
1-9