PXD20RM Datasheet, PDF (1585/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

Chapter 49
Wakeup Unit (WKPU)
49.1 Overview
The WKPU supports 24¹ external sources that can generate both interrupts and wakeup events, of which
one can cause non-maskable interrupt requests. Figure 49-1 is a block diagram of the Wakeup Unit and its
interfaces to other system components.
The WKPU operates separately from the external SIUL and its interrupt capability is independent from the
SIUL external interrupt feature.
The wakeup lines are mapped to the interrupt vectors as shown in Table 49-1.
Wakeup Unit
NMI / Wakeup
- Configuration
PLATFORM
PBRIDGE
NMI enable
filter bypass
wakeup
IPS
BUS
IRQ / Wakeup
- Configuration
filter bypass
sys wakeup
IRQs
filter
25
filter
PADS
IOMUX
Mode /
Power Ctl
4
Interrupt
Controller
0-25
RTC, etc.
Figure 49-1. Wakeup Unit block diagram
1. Up to 23 external sources in the 416-pin package; up to 19 external sources in the 208-pin package; up to 15 external sources
in the 176-pin package
Freescale Semiconductor
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
49-1