SX8801IRXXMLTRT View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SX8801IRXXMLTRT' PDF : 135 Pages View PDF
XE8801A – SX8801R
11.4 Interrupts and events map
Interrupt source
pa_irqbus[5]
pa_irqbus[4]
pa_irqbus[1]
pa_irqbus[0]
pa_irqbus[7]
pa_irqbus[6]
pa_irqbus[3]
pa_irqbus[2]
Default mapping in
the interrupt manager
RegIrqMid[5]
RegIrqMid[4]
RegIrqMid[1]
RegIrqMid[0]
RegIrqLow[7]
RegIrqLow[6]
RegIrqLow[3]
RegIrqLow[2]
Default mapping in the
event manager
RegEvn[4]
RegEvn[0]
11.5 Port A (PA) Operation
The Port A input status (debounced or not) can be read from RegPAin.
Debounce mode:
Each bit in Port A can be individually debounced by setting the corresponding bit in RegPADebounce. After reset,
the debounce function is disabled. After enabling the debouncer, the change of the input value is accepted only if
the input value is identical at two consecutive sampling on the rising edge of the selected clock. Selection of the
clock is done by the bit DebFast in Register RegSysMisc (see clock block documentation for more precision on
the frequency).
DebFast
0
1
Clock filter
256 Hz
8 kHz
Table 11-7: debounce frequency selection
Input
CkDebounce
Debounced
1
1
2
1
1
2
Figure 11-2: digital debouncer
Pull-ups:
When the corresponding bit in RegPAPullup is set to 0, the inputs are floating (pull-up resistors are disconnected).
When the corresponding bit in RegPAPullup is set to 1, a pull-up resistor is connected to the input pin. Port A
starts up with the pull-up resistors disconnected.
Port A as an interrupt source:
Each Port A input is an interrupt request source and can be set on rising or falling edge with the corresponding bit
in RegPAEdge. After reset, the rising edge is selected for interrupt generation by default. The interrupt source can
be debounced by setting register RegPADebounce.
Note: care must be taken when modifying RegPAEdge because this register performs an edge selection. The
change of this register may result in a transition which may be interpreted as a valid interruption.
© Semtech 2005
11-4
www.semtech.com
Share Link: 
