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H8S/2218 Scheda tecnica(PDF) 451 Page - Renesas Technology Corp |
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H8S/2218 Scheda tecnica(HTML) 451 Page - Renesas Technology Corp |
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451 / 750 page  Section 12 Serial Communication Interface Rev.6.00 Jun. 03, 2008 Page 403 of 698 REJ09B0074-0600 12.4 Operation in Asynchronous Mode Figure 12.5 shows the general format for asynchronous serial communication. One frame consists of a start bit (low level), followed by data (in LSB-first order), a parity bit (high or low level), and finally stop bits (high level). In asynchronous serial communication, the transmission line is usually held in the mark state (high level). The SCI monitors the transmission line. When the transmission line goes to the space state (low level), the SCI recognizes a start bit and starts serial communication. Inside the SCI, the transmitter and receiver are independent units, enabling full- duplex. Both the transmitter and the receiver also have a double-buffered structure, so data can be read from or written during transmission or reception, enabling continuous data transfer. LSB Start bit MSB Idle state (mark state) Stop bit 0 Transmit/receive data D0 D1 D2 D3 D4 D5 D6 D7 0/1 1 1 1 1 Serial data Parity bit 1 bit 1 or 2 bits 7 or 8 bits 1 bit, or none One unit of transfer data (character or frame) Figure 12.5 Data Format in Asynchronous Communication (Example with 8-Bit Data, Parity, Two Stop Bits) |
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