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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AT90LS4433-4AI 데이터시트(PDF) 82 Page - ATMEL Corporation |
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AT90LS4433-4AI 데이터시트(HTML) 82 Page - ATMEL Corporation |
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82 / 126 page  82 AT90S/LS4433 1042H–AVR–04/03 •TXD – Port D, Bit 1 Transmit Data (Data Output pin for the UART). When the UART Transmitter is enabled, this pin is configured as an output, regardless of the value of DDD1. • RXD – Port D, Bit 0 Receive Data (Data Input pin for the UART). When the UART Receiver is enabled, this pin is configured as an input, regardless of the value of DDD0. When the UART forces this pin to be an input, a logical “1” in PORTD0 will turn on the internal pull-up. Port D Schematics Note that all port pins are synchronized. The synchronization latches are, however, not shown in the figures. Figure 57. Port D Schematic Diagram (Pin PD0) D D Q Q RESET RESET C C WD WP RD MOS PULL- UP PD0 RXD RXEN WP: WD: RL: RP: RD: RXD: RXEN: WRITE PORTD WRITE DDRD READ PORTD LATCH READ PORTD PIN READ DDRD UART RECEIVE DATA UART RECEIVE ENABLE DDD0 PORTD0 RL RP |
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