Introduction
PXN20 Microcontroller Reference Manual, Rev. 1
1-12 Freescale Semiconductor
— Separate transmitter and receiver CPU interrupt sources
— 16-bit programmable baud-rate modulus counter and 16-bit fractional
— 2 receiver wake-up methods
• LIN features:
— Autonomous LIN frame handling
— Message buffer to store identifier and up to eight data bytes
— Supports message length of up to 64 bytes
— Detection and flagging of LIN errors
— Sync field; Delimiter; ID parity; Bit, Framing; Checksum and Timeout errors
— Classic or extended checksum calculation
— Configurable Break duration of up to 36-bit times
— Programmable Baud rate prescalers (13-bit mantissa, 4-bit fractional)
— Diagnostic features
– Loop back
–Self Test
– LIN bus stuck dominant detection
— Interrupt driven operation with 16 interrupt sources
— LIN slave mode features
– Autonomous LIN header handling
– Autonomous LIN response handling
– Discarding of irrelevant LIN responses using up to 16 ID filters
1.7.10 Controller Area Network Module (CAN)
The enhanced CAN module features the following:
• Compliant with CAN protocol specification, Version 2.0B active
• 64 mailboxes, each configurable as transmit or receive
— Mailboxes configurable while module remains syncronised to CAN bus
• Transmit features
— Arbitration scheme according to message ID, message buffer number or local priority
— Internal arbitration to guarantee no inner priority inversion
— Multiple transmit buffers to avoid outer priority inversion
— Transmit abort procedure and notification
• Receive features
— Individual programmable filters for each mailbox
— Hardware FIFO can be enabled
– 8 mailboxes can be configured to provide a 6-entry receive FIFO and 8 programmable
acceptance filters
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