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7630 Datasheet(PDF) 129 Page - Renesas Technology Corp |
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7630 Datasheet(HTML) 129 Page - Renesas Technology Corp |
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129 / 238 page  7630 Group User’s Manual $33/,&$7,21 2-63 2.4 Controller Area Network (CAN) module To overcome this situation, the module features an abort transmission request function. This function is controlled by the transmit abort control bit CABORT.0 (Figure 2.4.17); setting this bit withdraws the transmit request of the frame currently occupying the transmit buffer. Requesting transmit abort during the transmission process (CTRM.7 = 1) does not interrupt the process to avoid causing erroneous frames being sent. In result of the abort transmit request, the module will: 1. Clear the transmit buffer control bit CTRM.5 (thereby release the buffer). 2. Clear the transmit request bit CTRM.3. 3. Clear the transmit abort control bit CABORT.0. As the abort transmission request might fall together with an ongoing transmission, the buffer might not be availa- ble immediately after issuing the abort transmission request. Therefore the re-initialization of the buffer should not be started before having confirmed its availability via CTRM.5 (refer to section 2.4.9). |
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