HC05 datasheet(63/232 Pages) MOTOROLA

63 / 232 page

MC68HC05X16

Rev. 1

MOTOROLA

5-1

MOTOROLA CAN MODULE (MCAN)

The MCAN includes all hardware modules necessary to implement the CAN transfer layer, which

represents the kernel of the CAN bus protocol as deﬁned by BOSCH GmbH, the originators of the

CAN speciﬁcation. For full details of the CAN protocol please refer to the published speciﬁcations.

Up to the message level, the MCAN is totally compatible with the full CAN implementation.

Functional differences are related to the object layer only. Whereas a full CAN controller provides

dedicated hardware for handling a set of messages, the MCAN is restricted to receiving and/or

transmitting messages on a message by message basis.

The MCAN will never initiate an overload frame. If the MCAN starts to receive a valid message

(one that passes the acceptance ﬁlter) and there is no receive buffer available for it then the

overrun ﬂag in the CPU status register will be set. The MCAN will respond to overload frames

generated by other CAN nodes, as required by the CAN protocol. A summary of all the MCAN

frame formats is given in Figure 5-2 for reference. A diagram of the major blocks of the MCAN is

shown in Figure 5-1.

Figure 5-1 MCAN block diagram

Interface

management

logic

Transmit

buffer

Receive

buffer 0

Receive

buffer 1

Bit timing

logic

Transceive

logic

Bit stream

processor

Error

management

logic

Line

interface

logic

Microprocessor related logic

Bus line related logic

MCAN

bus

line

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