CP3SP33SMSSLASHNOPB datasheet(190/407 Pages) TI1

190 / 407 page

CP3SP33

SNOSCW5 – MAY 2013

www.ti.com

If the transmit process fails or the arbitration is lost, the transmission process will be stopped and will

continue after the interrupting reception or the error signaling has finished (see Figure 22-23). In that case,

a new buffer select follows and the TX process is executed again.

NOTE

The canceled message can be delayed by a TX request of a buffer with a higher priority.

While TX_BUSY is high, software cannot change the contents of the message buffer object.

In all cases, writing to the BUSY bit will be ignored.

22.6.2 Transmit Priority

The CAN module is able to generate a stream of scheduled messages without releasing the bus between

two messages so that an optimized performance can be achieved. It will arbitrate for the bus immediately

after sending the previous message and will only release the bus due to a lost arbitration.

If more than one buffer is scheduled for transmission, the priority is built by the message buffer number

and the priority code in the CNSTAT register. The 8-bit value of the priority is combined by the 4-bit TXPRI

value and the 4-bit buffer number (0...14) as shown below. The lowest resulting number results in the

highest transmit priority.

4M M3

TXPRI

BUFFER #

Table 22-3 shows the transmit priority configuration if the priority is TXPRI = 0 for all transmit buffers.

Table 22-3. Transmit Priority (TXPRI = 0)

TXPRI

BUFFER NUMBER

PRI

TX PRIORITY

Highest

Lowest

Table 22-4 shows the transmit priority configuration if TXPRI is different from the buffer number.

Table 22-4. Transmit Priority (TXPRI not 0)

TXPRI

BUFFER NUMBER

PRI(1)

TX PRIORITY

224

Lowest

209

194

179

164

149

134

119

104

(1)

If two buffers have the same priority (PRI), the buffer with the lower

buffer number will have the higher priority.

190

Dual CAN Interfaces

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