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TMP86FS49AIUG 数据表(PDF) 159 Page - Toshiba Semiconductor |
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TMP86FS49AIUG 数据表(HTML) 159 Page - Toshiba Semiconductor |
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159 / 296 page  Page 143 TMP86FS49AIUG 12.4 Transfer Rate The baud rate of UART1 is set of UART1CR1<BRG>. The example of the baud rate are shown as follows. When TC3 is used as the UART1 transfer rate (when UART1CR1<BRG> = “110”), the transfer clock and transfer rate are determined as follows: Transfer clock [Hz] = TC3 source clock [Hz] / TTREG3 setting value Transfer Rate [baud] = Transfer clock [Hz] / 16 12.5 Data Sampling Method The UART1 receiver keeps sampling input using the clock selected by UART1CR1<BRG> until a start bit is detected in RXD1 pin input. RT clock starts detecting “L” level of the RXD1 pin. Once a start bit is detected, the start bit, data bits, stop bit(s), and parity bit are sampled at three times of RT7, RT8, and RT9 during one receiver clock interval (RT clock). (RT0 is the position where the bit supposedly starts.) Bit is determined according to majority rule (The data are the same twice or more out of three samplings). Figure 12-4 Data Sampling Method Table 12-1 Transfer Rate (Example) BRG Source Clock 16 MHz 8 MHz 4 MHz 000 76800 [baud] 38400 [baud] 19200 [baud] 001 38400 19200 9600 010 19200 9600 4800 011 9600 4800 2400 100 4800 2400 1200 101 2400 1200 600 RT0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 1 2 3 4 5 6 7 8 9 10 11 Bit 0 Start bit Bit 0 Start bit (a) Without noise rejection circuit RT clock Internal receive data RT0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 1 2 3 4 5 6 7 8 9 10 11 Bit 0 Start bit Bit 0 Start bit RT clock Internal receive data (b) With noise rejection circuit RXD1 pin RXD1 pin |
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