PXS20 Datasheet, PDF (15/119 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

1.5.23 Non-Maskable Interrupt (NMI)
The non-maskable interrupt with de-glitching filter supports high-priority core exceptions.
Introduction
1.5.24 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.
The BAM provides the following features:
• Enables booting via serial mode (CAN or LIN/UART)
• Supports programmable 64-bit password protection for serial boot mode
• Supports serial bootloading of either classic PowerPC Book E code (default) or Freescale VLE code
• Automatic switch to serial boot mode if internal flash memory is blank or invalid
1.5.25 System Status and Configuration Module (SSCM)
The SSCM on this device features the following:
• System configuration and status
• Debug port status and debug port enable
• Multiple boot code starting locations out of reset through implementation of search for valid Reset Configuration Half
Word
• Sets up the MMU to allow user boot code to execute as either classic PowerPC Book E code (default) or as Freescale
VLE code out of flash memory
• Triggering of device self-tests during reset phase of device boot
1.5.26 Controller Area Network Module (CAN)
The CAN module is a communication controller implementing the CAN protocol according to Bosch Specification version
2.0B. Although the CAN interface was designed to be used primarily as a vehicle networking bus, it is widely used in industrial
and other transport applications due to its robust operation, time determinism, cost effectiveness, and optional redundant
physical layer implementation.
The CAN module provides the following features:
• Full implementation of the CAN protocol specification, version 2.0B
— Standard data and remote frames
— Extended data and remote frames
— 0 to 8 bytes data length
— Programmable bit rate as fast as 1Mbit/s
• 32 message buffers of 0 to 8 bytes data length
• Each message buffer configurable as receive or transmit buffer, all supporting standard and extended messages
• Programmable loop-back mode supporting self-test operation
• 3 programmable mask registers
• Programmable transmit-first scheme: lowest ID or lowest buffer number
• Time stamp based on 16-bit free-running timer
• Global network time, synchronized by a specific message
• Maskable interrupts
• Independent of the transmission medium (an external transceiver is assumed)
• High immunity to EMI
PXS20 Microcontroller Data Sheet, Rev. 1
Freescale Semiconductor
15
Preliminary—Subject to Change Without Notice