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UPD789026 Datasheet(PDF) 35 Page - NEC |
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UPD789026 Datasheet(HTML) 35 Page - NEC |
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35 / 213 page  CHAPTER 2 PIN FUNCTIONS User's Manual U11919EJ3V0UM00 35 2.2 Description of Pin Functions 2.2.1 P00 to P07 (Port 0) These pins constitute an 8-bit I/O port and can be set in the input or output port mode in 1-bit units by using port mode register 0 (PM0). When these pins are used as an input port, an on-chip pull-up resistor can be used in the pull-up resistor option register (PUO). This port can drive LEDs directly. 2.2.2 P10 to P17 (Port 1) These pins constitute an 8-bit I/O port. Can be set in the input or output port mode in 1-bit units by using port mode register 1 (PM1). When these pins are used as an input port, an on-chip pull-up resistor can be used in the pull-up resistor option register (PUO). This port can drive LEDs directly. 2.2.3 P20 to P22 (Port 2) These pins constitute a 3-bit I/O port. In addition, these pins provide the function to input/output the data and clock of the serial interface. This port can drive LEDs directly. Port 2 can be specified in the following operation modes in bit-wise. (1) Port mode In this mode, port 2 functions as a 3-bit I/O port. Port 2 can be set in the input or output mode in 1-bit units by using the port mode register 2 (PM2). When the port is used as an input port, an on-chip pull-up resistor can be used in the pull-up resistor option register (PUO). (2) Control mode In this mode, port 2 functions as the data input/output and the clock input/output of the serial interface. (a) SI0, SO0 These are the serial data I/O pins of the serial interface. (b) SCK0 This is the serial clock I/O pin of the serial interface. (c) RxD, TxD These are the serial data I/O pins of asynchronous serial interface. (d) ASCK This is the serial clock input pin of asynchronous serial interface. Caution When using port 2 as serial interface pins, the input/output mode and output latch must be set according to the functions to be used. For details of the setting, see Table 9-2. |
Número de pieza similar - UPD789026 |
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Descripción similar - UPD789026 |
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