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S9S12GN48F0CLH Datasheet, PDF (585/1292 Pages) Freescale Semiconductor, Inc – MC9S12G Family Reference Manual and Data Sheet | |||
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Freescaleâs Scalable Controller Area Network (S12MSCANV3)
18.1.3 Features
The basic features of the MSCAN are as follows:
⢠Implementation of the CAN protocol â Version 2.0A/B
â Standard and extended data frames
â Zero to eight bytes data length
â Programmable bit rate up to 1 Mbps1
â Support for remote frames
⢠Five receive buffers with FIFO storage scheme
⢠Three transmit buffers with internal prioritization using a âlocal priorityâ concept
⢠Flexible maskable identiï¬er ï¬lter supports two full-size (32-bit) extended identiï¬er ï¬lters, or four
16-bit ï¬lters, or eight 8-bit ï¬lters
⢠Programmable wake-up functionality with integrated low-pass ï¬lter
⢠Programmable loopback mode supports self-test operation
⢠Programmable listen-only mode for monitoring of CAN bus
⢠Programmable bus-off recovery functionality
⢠Separate signalling and interrupt capabilities for all CAN receiver and transmitter error states
(warning, error passive, bus-off)
⢠Programmable MSCAN clock source either bus clock or oscillator clock
⢠Internal timer for time-stamping of received and transmitted messages
⢠Three low-power modes: sleep, power down, and MSCAN enable
⢠Global initialization of conï¬guration registers
18.1.4 Modes of Operation
For a description of the speciï¬c MSCAN modes and the module operation related to the system operating
modes refer to Section 18.4.4, âModes of Operationâ.
18.2 External Signal Description
The MSCAN uses two external pins.
NOTE
On MCUs with an integrated CAN physical interface (transceiver) the
MSCAN interface is connected internally to the transceiver interface. In
these cases the external availability of signals TXCAN and RXCAN is
optional.
18.2.1 RXCAN â CAN Receiver Input Pin
RXCAN is the MSCAN receiver input pin.
1. Depending on the actual bit timing and the clock jitter of the PLL.
MC9S12G Family Reference Manual, Rev.1.23
Freescale Semiconductor
587
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