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HD64F36034 Datasheet(PDF) 368 Page - Renesas Technology Corp |
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HD64F36034 Datasheet(HTML) 368 Page - Renesas Technology Corp |
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368 / 592 page  Section 15 Controller Area Network for Tiny (TinyCAN) Rev. 4.00 Mar. 15, 2006 Page 336 of 556 REJ09B0026-0400 15.5.4 Message Reception Figure 15.14 shows a message reception flowchart. Figure 15.15 shows the set timing for TXPR and TXCR during reception. A transmit request can be canceled by TXCR at any time during reception. Yes Yes Yes Yes No No No No Frame received *1 *1 *1 *1 n = 0? Receive frame ID and Mailboxn ID + LAFM match? MBn in RXPR or MBn in RFPR set to 1? EOF received n = 3 (n: Mailbox number) TinyCAN is in idle state Unread message overwrite Unread message overrun Discard unread message Overwrite with receive message Set MBn in UMSR to 1 Set OVRI in TCIRR1 to 1 (when MBn in MBIMR = 1) Interrupt occurred (when OVRIM in TCIRR1 = 0) Overwrite with unread message Discard receive message Set MBn in UMSR to 1 Set OVRI in TCIRR1 to 1 (when MBn in MBIMR = 1) Interrupt occurred (when OVRIM in TCIRR1 = 0) Message reception Note: Processing in a shaded box requires setting by software. Write receive message Set MBn in RXPR or MBn in RFPR to 1 Set DFRI in TCIRR0 or RFRI in TCIRR0 to 1 (when MBn in MBIMR = 1) Interrupt occurred (when DFRIM in TCIMR0 or RFRIM in TCIMR0 = 0) NMC = 1? n = n − 1 Read TCIRR Clear MBn in UMSR to 0 DFRI in TCIRR0 set to 1? Read MBn in RXPR = 1 OVRI in TCIRR1 set to 1? Read MBn in UMSR = 1 Read Mailboxn Read MBn in RXPR = 0 TinyCAN data frame receive operation end MBn in UMSR cleared to 0? Clear MBn in RXPR to 0 RFRI in TCIRR0 set to 1? Read MBn in RFPR = 1 Other interrupt processing Read Mailboxn Read MBn in RFPR = 0 TinyCAN remote frame receive operation end MBn in UMSR cleared to 0? Clear MBn in RFPR to 0 No No No No No Yes Yes Yes Yes Yes Figure 15.14 Message Reception Flowchart |
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