Datasheet

108
32072H–AVR32–10/2012
AT32UC3A3
11.3 Block Diagram
Figure 11-1. EIC Block Diagram
11.4 I/O Lines Description
11.5 Product Dependencies
In order to use this module, other parts of the system must be configured correctly, as described
below.
11.5.1 I/O Lines
The external interrupt pins (EXTINTn and NMI) are multiplexed with I/O lines. To generate an
external interrupt from an external source the source pin must be configured as an input pins by
the I/O Controller. It is also possible to trigger the interrupt by driving these pins from registers in
the I/O Controller, or another peripheral output connected to the same pin.
11.5.2 Power Management
All interrupts are available in all sleep modes as long as the EIC module is powered. However, in
sleep modes where CLK_SYNC is stopped, the interrupt must be configured to asynchronous
mode.
Edge/Level
Detector
Mask
IR Q n
EXTINTn
NMI
IN T n
LEVEL
MODE
EDGE
IE R
ID R
IC R
CTRL
IS R
IM R
Filter
FILTER
Polarity
control
LEVEL
MODE
EDGE
Asynchronus
detector
EIC_WAKE
Enable
EN
DIS
CTRL
CLK_SYNC
Wake
detect
ASYNC
Prescaler Shifter
PRESC
EN
SCAN
PIN
SCANm
CLK_RCSYS
Table 11-1. I/O Lines Description
Pin Name Pin Description Type
NMI Non-Maskable Interrupt Input
EXTINTn External Interrupt Input
SCANm
Keypad scan pin m
Output