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7630 Datasheet(PDF) 130 Page - Renesas Technology Corp |
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7630 Datasheet(HTML) 130 Page - Renesas Technology Corp |
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130 / 238 page  7630 Group User’s Manual 2-64 $33/,&$7,21 2.4 Controller Area Network (CAN) module Fig. 2.4.38 Flowchart of transmit process Read 0 initialize transmit buffer registers set transmit buffer control bit CTRM.5 Write 1 Write 1 set transmit request bit CTRM.3 Await CAN successful transmission transmit buffer vacant (CTRM.5=0)? Read 1 transmit request CTRM.3=1? No Yes set transmit status bit CTRM.7 Write 1 start transmission bus arbitration win? continue transmission no errors detected? clear transmit request bit clear transmit buffer control bit CTRM.3,5 set CST interrupt request bit Yes Yes Write 0 CTRM: Clear transmit status bit No No Write 0 User software CAN module No Yes CTRM: CTRM: CTRM: CTRM: Read or Write 0 Read or Write 1 Symbols: Reserved Transmit process from user side and CAN module side CTRM: |
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