Freescale Semiconductor, Inc.
MSCAN Controller
real-time processing, reliable operation in the EMI environment of a
vehicle, cost-effectiveness and required bandwidth.
msCAN12 utilises an advanced buffer arrangement resulting in a
predictable real-time behaviour and simplifies the application software.
17.3 External Pins
The msCAN12 uses 2 external pins, 1 input (RxCAN) and 1 output
(TxCAN). The TxCAN output pin represents the logic level on the CAN:
0 is for a dominant state, and 1 is for a recessive state.
RxCAN is on bit 0 of Port CAN, TxCAN is on bit 1. The remaining six pins
of Port CAN (112TQFP version only) are controlled by registers in the
msCAN12 address space (see msCAN12 Port CAN Control Register
(PCTLCAN) and msCAN12 Port CAN Data Direction Register
(DDRCAN)).
A typical CAN system with msCAN12 is shown in Figure 17-1.
Each CAN station is connected physically to the CAN bus lines through
a transceiver chip. The transceiver is capable of driving the large current
needed for the CAN and has current protection, against defective CAN
or defective stations.
Advance Information
278
68HC(9)12D60 — Rev 4.0
MSCAN Controller
MOTOROLA
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