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MG82FE308 Datasheet(PDF) 60 Page - Megawin Technology Co., Ltd |
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MG82FE308 Datasheet(HTML) 60 Page - Megawin Technology Co., Ltd |
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60 / 94 page  60 MG82FEL308_316 Data Sheet MEGAWIN 12.2. Serial Port Mode 1 10 bits are transmitted through TXD, or received through RXD: a start bit (0), 8 data bits (LSB first), and a stop bit (1). On receive, the stop bit goes into RB8 in SCON. The baud rate is determined by the Timer 1 or Timer 2 overflow rate. Figure 12-1 shows the data frame in Mode 1 and Figure 12-6 shows a simplified functional diagram of the serial port in Mode 1. Transmission is initiated by any instruction that uses SBUF as a destination register. The “write to SBUF” signal requests the UART engine to start the transmission. After receiving a transmission request, the UART engine would start the transmission at the raising edge of TX Clock. The data in the SBUF would be serial output on the TXD pin with the data frame as shown in Figure 12-1 and data width depend on TX Clock. After the end of 8th data transmission, TI would be asserted by hardware to indicate the end of data transmission. Reception is initiated when Serial Port Controller detected 1-to-0 transition at RXD sampled by RCK. The data on the RXD pin would be sampled by Bit Detector in Serial Port Controller. After the end of STOP-bit reception, RI would be asserted by hardware to indicate the end of data reception and load STOP-bit into RB8 in SCON register. Figure 12-6 Serial Port Mode 1, 2, 3 UART engine 80C51 Internal BUS TXBUF RXBUF 80C51 Internal BUS Read SBUF Write SBUF RxD TxD 16 SMOD1 2 RCLK TCLK TX Clock Timer 1 Overflow “1” “1” “0” “0” “0” “1” Timer 2 Overflow 2 SYSCLK/2 “0” “1” 0 1 0 1 16 RX Clock TI RI Serial Port Interrupt STOP -Bit 9th-Bit 0 1 SM0 SM1 SM1 SM0 RB8 SM1 TB8 Mode 1, 3 clock source Mode 2 clock source RCK SMOD2 |
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Similar Description - MG82FE308 |
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