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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST92196A датащи(PDF) 192 Page - STMicroelectronics |
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ST92196A датащи(HTML) 192 Page - STMicroelectronics |
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192 / 268 page  192/268 - SERIAL COMMUNICATIONS INTERFACE (SCI) 8.11 SERIAL COMMUNICATIONS INTERFACE (SCI) 8.11.1 Introduction The Serial Communications Interface (SCI) offers full-duplex asynchronous serial data exchange for interfacing a wide range of external equipment. It has the following principal features: s Full duplex asynchronous operation. s Transmit, receive, line status, and device address interrupt generation. s Integral Baud Rate Generator capable of dividing the input clock by any value from 2 to 216-1 (16 bit word) and generating the internal 16X data sampling clock for asynchronous operation. s Fully programmable serial interface: – 5, 6, 7, or 8 bit word length. – Even, odd, or no parity generation and detec- tion. – 0, 1, 1-1/2, 2, 2-1/2, 3 stop bit generation. – Complete status reporting capabilities. – Line break generation and detection. s Programmable address indication bit (wake-up bit) and user invisible compare logic to support multiple microcomputer networking. Optional character search function. s Internal diagnostic capabilities: – Local loopback for communications link fault isolation. – Auto-echo for communications link fault isola- tion. s Separate interrupt/DMA channels for transmit and receive. Figure 82. SCI Block Diagram TRANSMIT BUFFER REGISTER REGISTER SHIFT TRANSMIT REGISTER SHIFT RECEIVER REGISTER COMPARE ADDRESS REGISTER BUFFER RECEIVER DMA CONTROLLER CLOCK and BAUD RATE GENERATOR ST9 CORE BUS SOUT SIN Frame Control and STATUS DMA CONTROLLER |
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