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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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Q67127-C2030 데이터시트(PDF) 35 Page - Siemens Semiconductor Group |
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Q67127-C2030 데이터시트(HTML) 35 Page - Siemens Semiconductor Group |
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35 / 85 page  Semiconductor Group 35 1997-12-01 C505 / C505C C505A / C505CA Serial Interface (USART) The serial port is full duplex and can operate in four modes (one synchronous mode, three asynchronous modes) as illustrated in table 8. For clarification some terms regarding the difference between "baud rate clock" and "baud rate" should be mentioned. In the asynchronous modes the serial interfaces require a clock rate which is 16 times the baud rate for internal synchronization. Therefore, the baud rate generators/timers have to provide a "baud rate clock" (output signal in figure 14 to the serial interface which - there divided by 16 - results in the actual "baud rate". Further, the abbrevation fOSC refers to the oscillator frequency (crystal or external clock operation). The variable baud rates for modes 1 and 3 of the serial interface can be derived either from timer 1 or from a decdicated baud rate generator (see figure 14). Table 8 USART Operating Modes Mode SCON Description SM0 SM1 0 0 0 Shift register mode, fixed baud rate Serial data enters and exits through R ×D; T×D outputs the shift clock; 8-bit are transmitted/received (LSB first) 1 0 1 8-bit UART, variable baud rate 10 bits are transmitted (through T ×D) or received (at R×D) 2 1 0 9-bit UART, fixed baud rate 11 bits are transmitted (through T ×D) or received (at R×D) 3 1 1 9-bit UART, variable baud rate Like mode 2 |
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