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PXS20 Datasheet, PDF (16/119 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller | |||
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Introduction
⢠Short latency time due to an arbitration scheme for high-priority messages
⢠Transmit features
â Supports configuration of multiple mailboxes to form message queues of scalable depth
â Arbitration scheme according to message ID or message buffer number
â Internal arbitration to guarantee no inner or outer priority inversion
â Transmit abort procedure and notification
⢠Receive features
â Individual programmable filters for each mailbox
â 8 mailboxes configurable as a 6-entry receive FIFO
â 8 programmable acceptance filters for receive FIFO
⢠Programmable clock source
â System clock
â Direct oscillator clock to avoid FMPLL jitter
1.5.27 FlexRay
The FlexRay module provides the following features:
⢠Full implementation of FlexRay Protocol Specification 2.1 Rev. A
⢠64 configurable message buffers can be handled
⢠Dual channel or single channel mode of operation, each as fast as 10 Mbit/s data rate
⢠Message buffers configurable as transmit or receive
⢠Message buffer size configurable
⢠Message filtering for all message buffers based on Frame ID, cycle count, and message ID
⢠Programmable acceptance filters for receive FIFO
⢠Message buffer header, status, and payload data stored in system memory (SRAM)
⢠Internal FlexRay memories have error detection and correction
1.5.28 Serial Communication Interface Module (UART)
The UART module with DMA support on this device features the following:
⢠UART features:
â Full-duplex operation
â Standard non return-to-zero (NRZ) mark/space format
â Data buffers with 4-byte receive, 4-byte transmit
â Configurable word length (8-bit or 9-bit words)
â Error detection and flagging
â Parity, noise and framing errors
â Interrupt driven operation with 4 interrupts sources
â Separate transmitter and receiver CPU interrupt sources
â 16-bit programmable baud-rate modulus counter and 16-bit fractional
â 2 receiver wake-up methods
⢠LIN features:
â Autonomous LIN frame handling
â Message buffer to store identifier and up to eight data bytes
â Supports message length of up to 64 bytes
â Detection and flagging of LIN errors
PXS20 Microcontroller Data Sheet, Rev. 1
16
Freescale Semiconductor
PreliminaryâSubject to Change Without Notice
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