PXR40 Product Brief, Rev. 1

Preliminary—Subject to Change Without Notice

Features

Freescale Semiconductor

18

— Control of virtual I/O via SPI serialization

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System reset monitoring and generation

— Power-on reset support

— Reset status register provides last reset source to software

— Glitch detection on reset input

— Software controlled reset assertion

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External interrupt

— Sixteen interrupt requests

— Rising or falling edge event detection

— Programmable digital filter for glitch rejection

— Critical interrupt request

— Non maskable interrupt request

•GPIO

— Virtual GPIO via SPI serialization (requires external deserialization device)

— Dedicated input and output registers for setting each GPIO and virtual-GPIO pin

— Parallel GPIO enables access to as many as eight GPIOs in one write

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Internal multiplexing

— Allows serial and parallel chaining of SPIs

— Allows flexible selection of eQADC trigger inputs

— Allows selection of interrupt requests between external pins and SPI

2.5.20

Boot assist module (BAM)

The BAM is a block of read-only memory containing code that is executed every time the MCU is

powered-on or reset in normal mode. The BAM supports multiple boot modes:

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Booting from internal flash memory

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Serial boot loading (a program is downloaded into on-chip general-purpose SRAM via UART or

the CAN and then executed)

The BAM also reads the reset configuration half word (RCHW) from flash memory (which may be

external to the device) and configures the PXR40 hardware accordingly. The BAM provides the following

features:

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Sets up MMU to cover all resources and mapping all physical addresses to logical addresses with

minimum address translation

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Sets up the MMU to allow application boot code to execute as either Classic Power Architecture

Book E code (default) or as Freescale VLE code

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Location and detection of application boot code

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Automatic switch to serial boot mode if internal flash memory is blank or invalid

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Supports software-programmable 64-bit password protection for serial boot mode

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