HC05 datasheet(71/232 Pages) MOTOROLA

71 / 232 page

MC68HC05X16

Rev. 1

MOTOROLA

5-9

MOTOROLA CAN MODULE (MCAN)

frame sequence (11 recessive bits). The designer must take this into consideration

when planning to use the sleep command.

COS — Clear overrun status

1 (set)

–

This clears the read-only data overrun status bit in the CSTAT register

(see Section 5.3.3). It may be written at the same time as RRB.

0 (clear) –

No action.

RRB — Release receive buffer

When set this releases the receive buffer currently attached to the CPU, allowing the buffer to be

reused by the MCAN. This may result in another message being received, which could cause

another receive interrupt request (if RIE is set). This bit is cleared automatically when a message

is received, i.e. when the RS bit (see Section 5.3.3) becomes set.

1 (set)

–

Released – receive buffer is available to the MCAN.

0 (clear) –

No action.

AT — Abort transmission

When this bit is set a pending transmission will be cancelled if it is not already in progress, allowing

the transmit buffer to be loaded with a new (higher priority) message when the buffer is released.

If the CPU tries to write to the buffer when it is locked, the information will be lost without being

signalled. The status register can be checked to see if transmission was aborted or is still in

progress.

1 (set)

–

Present – Abort transmission of any pending messages.

0 (clear) –

No action.

TR — Transmission request

1 (set)

–

Present – Depending on the transmission buffer’s content, a data

frame or a remote frame will be transmitted.

0 (clear) –

No action. This will not cancel a previously requested transmission;

the abort transmission command must be used to do this.

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