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PIC18F2680ISPSQTP データシート(PDF) 330 Page - Microchip Technology |
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PIC18F2680ISPSQTP データシート(HTML) 330 Page - Microchip Technology |
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330 / 482 page  PIC18F2585/2680/4585/4680 DS39625C-page 328 Preliminary © 2007 Microchip Technology Inc. 23.6.3 TRANSMIT PRIORITY Transmit priority is a prioritization within the PIC18F2585/2680/4585/4680 devices of the pending transmittable messages. This is independent from and not related to any prioritization implicit in the message arbitration scheme built into the CAN protocol. Prior to sending the SOF, the priority of all buffers that are queued for transmission is compared. The transmit buffer with the highest priority will be sent first. If two buffers have the same priority setting, the buffer with the highest buffer number will be sent first. There are four levels of transmit priority. If TXP bits for a particular message buffer are set to ‘11’, that buffer has the high- est possible priority. If TXP bits for a particular message buffer are set to ‘00’, that buffer has the lowest possible priority. FIGURE 23-2: TRANSMIT BUFFERS TXB0 Message Queue Control Transmit Byte Sequencer TXB1 TXB2 TXB3 - TXB8 |
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