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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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H8S/2218 数据表(PDF) 456 Page - Renesas Technology Corp |
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H8S/2218 数据表(HTML) 456 Page - Renesas Technology Corp |
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456 / 750 page  Section 12 Serial Communication Interface Rev.6.00 Jun. 03, 2008 Page 408 of 698 REJ09B0074-0600 12.4.5 Data Transmission (Asynchronous Mode) Figure 12.9 shows an example of operation for transmission in asynchronous mode. In transmission, the SCI operates as described below. 1. The SCI monitors the TDRE flag in SSR. If the flag is cleared to 0, the SCI recognizes that data has been written to TDR, and transfers the data from TDR to TSR. 2. After transferring data from TDR to TSR, the SCI sets the TDRE flag to 1 and starts transmission. If the TIE bit is set to 1 at this time, a transmit data empty interrupt request (TXI) is generated. Continuous transmission is possible because the TXI interrupt routine writes next transmit data to TDR before transmission of the current transmit data has been completed. 3. Data is sent from the TxD pin in the following order: start bit, transmit data, parity bit or multiprocessor bit (may be omitted depending on the format), and stop bit. 4. The SCI checks the TDRE flag at the timing for sending the stop bit. 5. If the TDRE flag is 0, the data is transferred from TDR to TSR, the stop bit is sent, and then serial transmission of the next frame is started. 6. If the TDRE flag is 1, the TEND flag in SSR is set to 1, the stop bit is sent, and then the "mark state" is entered, in which 1 is output. If the TEIE bit in SCR is set to 1 at this time, a TEI interrupt request is generated. TDRE TEND 0 1 frame D0 D1 D7 0/1 1 0 D0 D1 D7 0/1 1 1 1 Data Start bit Parity bit Stop bit Start bit Data Parity bit Stop bit TXI interrupt request generated Data written to TDR and TDRE flag cleared to 0 in TXI interrupt service routine TEI interrupt request generated Idle state (mark state) TXI interrupt request generated Figure 12.9 Example of Operation in Transmission in Asynchronous Mode (Example with 8-Bit Data, Parity, One Stop Bit) Figure 12.10 shows a sample flowchart for transmission in asynchronous mode. |
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