mc68hc05x4dw Freescale Semiconductor, Inc, mc68hc05x4dw Datasheet - Page 81

• Manufacturer Part Number: mc68hc05x4dw
• Description: Xc68hc705x4 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

13-mcan
RRB — Release receive buffer
AT — Abort transmission
TR — Transmission request
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
MCAN status register
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.
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1 = Released – receive buffer is available to the MCAN.
0 = No action.
1 = Present – Abort transmission of any pending messages.
0 = No action.
1 = Present – Depending on the transmission buffer’s content, a
0 = No action. This will not cancel a previously requested
data frame or a remote frame will be transmitted.
transmission; the abort transmission command must be used
to do this.
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Motorola CAN
(CSTAT)) becomes set.
Interface to the MC68HC05X4 CPU
MC68HC05X4 Rev 1.0
Motorola CAN