PXS20RM Datasheet, PDF (54/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Introduction
• Windowed watchdog
• Program flow control monitor with 16-bit pseudorandom key generation
• Allows a high level of safety (SIL3 monitor)
The SWT module is replicated for each processor.
1.4.21 Fault Collection and Control Unit (FCCU)
The FCCU module has the following features:
• Redundant collection of hardware checker results
• Redundant collection of error information and latch of faults from critical modules on the device
• Collection of self-test results
• Configurable and graded fault control
— Internal reactions (no internal reaction, IRQ, Functional Reset, Destructive Reset, or Safe mode
entered)
— External reaction (failure is reported to the external/surrounding system via configurable
output pins)
1.4.22 System Integration Unit Lite (SIUL)
The SIUL controls MCU reset configuration, pad configuration, external interrupt, general purpose I/O
(GPIO), internal peripheral multiplexing, and system reset operation. The reset configuration block
contains the external pin boot configuration logic. The pad configuration block controls the static electrical
characteristics of I/O pins. The GPIO block provides uniform and discrete input/output control of the I/O
pins of the MCU.
The SIU provides the following features:
• Centralized pad control on a per-pin basis
— Pin function selection
— Configurable weak pull-up/down
— Configurable slew rate control (slow/medium/fast)
— Hysteresis on GPIO pins
— Configurable automatic safe mode pad control
• Input filtering for external interrupts
1.4.23 Non-Maskable Interrupt (NMI)
The non-maskable interrupt with de-glitching filter supports high-priority core exceptions.
1.4.24 Boot Assist Module (BAM)
The BAM is a block of read-only memory with hard-coded content. The BAM program is executed only
if serial booting mode is selected via boot configuration pins.
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PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor