 |
数据搜索系统，热门电子元器件搜索 |
|
|
数据搜索系统，热门电子元器件搜索 |
|
H8SX/1663 数据表(PDF) 755 Page - Renesas Technology Corp |
|
|
|||||||||||||||||||||||||||||
H8SX/1663 数据表(HTML) 755 Page - Renesas Technology Corp |
|
|
755 / 1158 page  Section 15 Serial Communication Interface (SCI, IrDA, CRC) Rev.1.00 Jun. 07, 2006 Page 703 of 1102 REJ09B0294-0100 15.4.5 Serial Data Transmission (Asynchronous Mode) Figure 15.9 shows an example of the operation for transmission in asynchronous mode. In transmission, the SCI operates as described below. 1. The SCI monitors the TDRE flag in SSR, and if it is cleared to 0, 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 in SCR is set to 1 at this time, a TXI interrupt request is generated. Because the TXI interrupt processing routine writes the next transmit data to TDR before transmission of the current transmit data has finished, continuous transmission can be enabled. 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 next transmit 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. Figure 15.10 shows a sample flowchart for transmission in asynchronous mode. 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 processing routine TEI interrupt request generated Idle state (mark state) TXI interrupt request generated Figure 15.9 Example of Operation for Transmission in Asynchronous Mode (Example with 8-Bit Data, Parity, One Stop Bit) |
|
链接网址 |
| ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 数据表链接 | 链接交换 | 制造商名单 All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Chinese ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
