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AT89SND2C-7FTULL Datasheet(PDF) 7 Page - ATMEL Corporation |
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AT89SND2C-7FTULL Datasheet(HTML) 7 Page - ATMEL Corporation |
7 / 236 page 7 AT8xC51SND2C 4341E–MP3–06/05 Table 7. UART Signal Description Table 8. SPI Controller Signal Description Table 9. TWI Controller Signal Description Table 10. Keypad Interface Signal Description Signal Name Type Description Alternate Function RXD I/O Receive Serial Data RXD sends and receives data in serial I/O mode 0 and receives data in serial I/O modes 1, 2 and 3. P3.0 TXD O Transmit Serial Data TXD outputs the shift clock in serial I/O mode 0 and transmits data in serial I/O modes 1, 2 and 3. P3.1 Signal Name Type Description Alternate Function MISO I/O SPI Master Input Slave Output Data Line When in master mode, MISO receives data from the slave peripheral. When in slave mode, MISO outputs data to the master controller. P4.0 MOSI I/O SPI Master Output Slave Input Data Line When in master mode, MOSI outputs data to the slave peripheral. When in slave mode, MOSI receives data from the master controller. P4.1 SCK I/O SPI Clock Line When in master mode, SCK outputs clock to the slave peripheral. When in slave mode, SCK receives clock from the master controller. P4.2 SS I SPI Slave Select Line When in controlled slave mode, SS enables the slave mode. P4.3 Signal Name Type Description Alternate Function SCL I/O TWI Serial Clock When TWI controller is in master mode, SCL outputs the serial clock to the slave peripherals. When TWI controller is in slave mode, SCL receives clock from the master controller. - SDA I/O TWI Serial Data SDA is the bidirectional Two Wire data line. - Signal Name Type Description Alternate Function KIN0 I Keypad Input Line Holding this pin high or low for 24 oscillator periods triggers a keypad interrupt. - |
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