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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M16C/1N датащи(PDF) 120 Page - Renesas Technology Corp |
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M16C/1N датащи(HTML) 120 Page - Renesas Technology Corp |
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120 / 238 page  Rev.1.00 Oct 20, 2004 page 108 of 222 M16C/1N Group 13. Serial I/O REJ09B0007-0100Z Bit rate generator (Address 00A116) Clock synchronous type (when internal clock is selected) UART reception Clock synchronous type UART transmission Clock synchronous type Clock synchronous type (when internal clock is selected) Clock synchronous type (when external clock is selected) Receive clock Transmit clock Receive clock Transmit clock Clock source selection Internal External Bit rate generator (Address 00A916) Clock source selection n0: Values set to UART0 bit rate generator (BRG0) n1: Values set to UART1 bit rate generator (BRG1) Clock output pin select switch RxD0 1 / (n0+1) 1 / (n1+1) 1/16 1/16 1/2 CLK0 f1 TxD0 RxD1 1/16 1/16 1/2 CLK1 TxD1 (UART1) (UART0) CLKS1 Reception control circuit Transmission control circuit Transmit/ receive unit CLK polarity reversing circuit Transmit/ receive unit Reception control circuit Transmission control circuit Clock synchronous type (when internal clock is selected) Clock synchronous type (when external clock is selected) UART reception Clock synchronous type UART transmission Clock synchronous type Clock synchronous type (when internal clock is selected) Internal External CLK polarity reversing circuit f32 f8 f1 f32 f8 fc fc 13. Serial I/O Serial I/O is configured as two channels: UART0 and UART1. UART0 and UART1 each have an exclusive timer to generate a transfer clock, so they operate independently of each other. Figure 13.1 shows the block diagram of UARTi (i=0,1). Figure 13.2 shows the block diagram of the transmit/ receive unit. UART0 has two operation modes: a clock synchronous serial I/O mode and a clock asynchronous serial I/ O mode (UART mode). The contents of the serial I/O mode select bits (bits 0 to 2 at addresses 00A016 and 00A816) determine whether UART0 is used as a clock synchronous serial I/O or as a UART. Although a few functions are different, UART0 and UART1 have almost the same functions. Figures 13.3 through 13.5 show the registers related to UARTi. Figure 13.1 Block diagram of UARTi (i= 0, 1) |
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