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T89C51SND1 Datasheet(PDF) 7 Page - ATMEL Corporation |
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T89C51SND1 Datasheet(HTML) 7 Page - ATMEL Corporation |
7 / 60 page 7 T8xC51SND1 Rev. D – 15-Nov-01 Table 7. UART Signal Description Table 8. SPI Controller Signal Description Table 9. 2-wire Controller Signal Description Table 10. A/D Converter 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 2-wire Serial Clock When 2-wire controller is in master mode, SCL outputs the serial clock to the slave peripherals. When 2-wire controller is in slave mode, SCL receives clock from the master controller. P1.6 SDA I/O 2-wire Serial Data SDA is the bidirectional 2-wire data line. P1.7 Signal Name Type Description Alternate Function AIN1:0 I A/D Converter Analog Inputs - AREFP I Analog Positive Voltage Reference Input - AREFN I Analog Negative Voltage Reference Input This pin is internally connected to AVSS. - |
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