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P912XDP512F0MPVR 数据表(PDF) 433 Page - Freescale Semiconductor, Inc |
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P912XDP512F0MPVR 数据表(HTML) 433 Page - Freescale Semiconductor, Inc |
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433 / 1348 page  Chapter 10 Freescale’s Scalable Controller Area Network (S12MSCANV3) MC9S12XDP512 Data Sheet, Rev. 2.21 Freescale Semiconductor 433 10.3.2.7 MSCAN Transmitter Flag Register (CANTFLG) The transmit buffer empty flags each have an associated interrupt enable bit in the CANTIER register. Table 10-10. CANRIER Register Field Descriptions Field Description 7 WUPIE1 1 WUPIE and WUPE (see Section 10.3.2.1, “MSCAN Control Register 0 (CANCTL0)”) must both be enabled if the recovery mechanism from stop or wait is required. Wake-Up Interrupt Enable 0 No interrupt request is generated from this event. 1 A wake-up event causes a Wake-Up interrupt request. 6 CSCIE CAN Status Change Interrupt Enable 0 No interrupt request is generated from this event. 1 A CAN Status Change event causes an error interrupt request. 5:4 RSTATE[1:0] Receiver Status Change Enable — These RSTAT enable bits control the sensitivity level in which receiver state changes are causing CSCIF interrupts. Independent of the chosen sensitivity level the RSTAT flags continue to indicate the actual receiver state and are only updated if no CSCIF interrupt is pending. 00 Do not generate any CSCIF interrupt caused by receiver state changes. 01 Generate CSCIF interrupt only if the receiver enters or leaves “bus-off” state. Discard other receiver state changes for generating CSCIF interrupt. 10 Generate CSCIF interrupt only if the receiver enters or leaves “RxErr” or “bus-off”2 state. Discard other receiver state changes for generating CSCIF interrupt. 11 Generate CSCIF interrupt on all state changes. 2 Bus-off state is defined by the CAN standard (see Bosch CAN 2.0A/B protocol specification: for only transmitters. Because the only possible state change for the transmitter from bus-off to TxOK also forces the receiver to skip its current state to RxOK, the coding of the RXSTAT[1:0] flags define an additional bus-off state for the receiver (see Section 10.3.2.5, “MSCAN Receiver Flag Register (CANRFLG)”). 3:2 TSTATE[1:0] Transmitter Status Change Enable — These TSTAT enable bits control the sensitivity level in which transmitter state changes are causing CSCIF interrupts. Independent of the chosen sensitivity level, the TSTAT flags continue to indicate the actual transmitter state and are only updated if no CSCIF interrupt is pending. 00 Do not generate any CSCIF interrupt caused by transmitter state changes. 01 Generate CSCIF interrupt only if the transmitter enters or leaves “bus-off” state. Discard other transmitter state changes for generating CSCIF interrupt. 10 Generate CSCIF interrupt only if the transmitter enters or leaves “TxErr” or “bus-off” state. Discard other transmitter state changes for generating CSCIF interrupt. 11 Generate CSCIF interrupt on all state changes. 1 OVRIE Overrun Interrupt Enable 0 No interrupt request is generated from this event. 1 An overrun event causes an error interrupt request. 0 RXFIE Receiver Full Interrupt Enable 0 No interrupt request is generated from this event. 1 A receive buffer full (successful message reception) event causes a receiver interrupt request. |
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