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AN1077 Datasheet(PDF) 7 Page - STMicroelectronics |
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AN1077 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 14 page 7/14 OVERVIEW OF ENHANCED CAN CONTROLLERS FOR ST7 AND ST9 MCUS Figure 1. Figure 1: bxCAN Block Diagram 3.3 TRANSMISSION HANDLING Three transmit mailboxes are provided to the application to set-up messages for transmission. Three mailboxes reduce software queuing and allow deterministic transmission. The Trans- mission Scheduler decides which mailbox has to be transmitted first according to the priority rules. Transmit Priority Rules BxCAN provides two modes for the transmit priority: s In identifier mode when more than one transmit mailbox are pending, the identifier of the message stored in the mailbox gives the transmission order. The message with the lowest identifier value has the highest priority according to the arbitration of the CAN protocol. s In FIFO mode the priority order is given by the transmit request order. This mode is well suited for segmented transmission. Mailbox 2 Mailbox 1 7 6 5 CAN 2.0B Active Core Mailbox 0 Transmission Acceptance Filters Tx Mailboxes Master Control Scheduler Master Status Transmit Control Transmit Status Transmit Priority Receive FIFO Error Status Error Int. Enable Tx Error Counter Rx Error Counter Diagnostic Bit Timing Filter Mode Filter Config. Page Select Interrupt Enable Mailbox 0 1 2 Receive FIFO 1 4 3 2 1 Filter 0 Mailbox 0 1 2 Receive FIFO 0 |
Similar Part No. - AN1077 |
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Similar Description - AN1077 |
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