SX1441EVK Semtech, SX1441EVK Datasheet - Page 34

• Manufacturer Part Number: SX1441EVK
• Description: KIT DEV FOR SX1441
• Manufacturer: Semtech
• Series: EasyBlue™r
• Type: Bluetoothr

Specifications of SX1441EVK

• For Use With/related Products: SX1441
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Contents: -
• Other names: SX1441DVK; SX1441DVK

Personal Area Network
The port PA starts up with the pull-up resistor connected and the snap-to-rail function disabled.
3.8.6 Interrupt Sources
Every PA port input is an interrupt source which can be enabled on a rising or falling edge with the corresponding
bit in RegPAEdge. After reset, the rising edge is selected for interrupt generation. The interrupt source can be
debounced by setting register RegPADebounce. The interrupt signals are sampled on the fastest clock in the
circuit. In order to guarantee that the interrupt is detected by the circuit, the minimal pulse length should be 1 cycle
of this clock. 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 if the
corresponding interrupt sources are not temporarily disabled in the interrupt controller.
3.8.7 Event Sources
Pins PA[0] and PA[1] are also available as events on the event controller.
3.8.8 Clock Sources
PA[0] to PA[3] input ports (debounced or not) are available as clock sources for the counter/timer/PWM
peripherals.
© Semtech 2006
RegPAPullup[i]
0
1
1
1
RegPASnapToRail[i]
X
0
1
1
Table 50 - PA pin state vs. RegPAPullup and RegPASnapToRail registers
Last externally forced PA[i] value
X
X
0
1
34
SX1441 – Bluetooth® 1.2 SoC
PA[i] pull
none (floating)
pull-up
pull-down
pull-up
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Data Sheet