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UPD784938 Datasheet(PDF) 55 Page - NEC |
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UPD784938 Datasheet(HTML) 55 Page - NEC |
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55 / 733 page  CHAPTER 2 PIN FUNCTIONS 55 Preliminary User’s Manual U13987EJ1V0UM00 2.2 Pin Functions 2.2.1 Normal operation mode (1) P00 to P07 (Port 0) ... 3-state input/output Port 0 is an 8-bit input/output port with an output latch, and has direct transistor drive capability. Input/output can be specified in 1-bit units by setting the port 0 mode register (PM0). Each pin incorporates a software programmable pull-up resistor. P00 to P03 and P04 to P07 can output the port 0 buffer register (P0L, P0H) contents at any time interval as 4-bit or 8-bit real-time output port. The real-time output port control register (RTPC) is used to select whether this port is used as a normal output port or a real-time output port. When RESET is input, port 0 is set as an input port (output high-impedance state), and the output latch contents become undefined. (2) P10 to P17 (Port 1) ... 3-state input/output Port 1 is an 8-bit input/output port with an output latch. Input/output can be specified in 1-bit units by setting the port 1 mode register (PM1). Each pin incorporates a software programmable pull-up resistor. This port has direct LED drive capability. Pins P12 to P14 can also be made to function as serial input/output pins by setting the port 1 mode control register (PMC1). When RESET is input, port 1 is set as an input port (output high-impedance state), and the output latch contents are undefined. Table 2-1. Port 1 Operation Modes Pin Name Port Mode Control Signal Input/Output Mode Operation to Operate as Control Pin P10 Input/output port — — P11 — — P12 ASCK2/SCK2 input/output Set (to 1) PMC12 bit of PMC1 P13 RxD2/SI2 input Set (to 1) PMC13 bit of PMC1 P14 TxD2/SO2 output Set (to 1) PMC14 bit of PMC1 P15 to P17 — — (a) Port mode P12 to P14 operate as port mode pins when the relevant bits of the port 1 mode control (PMC1) register are cleared (0), and P10 and P11 and P15 to P17 always operate as port mode pins. Input/output can be specified in 1-bit units by setting the port 1 mode register (PM1). (b) Control signal input/output mode P12 to P14 can be set as control pins in 1-bit units by setting the port 1 mode control (PMC1) register. (i) ASCK2/SCK2 ASCK2 is the asynchronous serial interface baud rate clock input pin. SCK2 is the serial clock input/output pin (in 3-wire serial I/O2 mode). (ii) RxD2/SI2 RxD2 is the asynchronous serial interface serial data input pin. SI2 is the serial data input pin (in 3-wire serial I/O2 mode). (iii) TxD2/SO2 TxD2 is the asynchronous serial interface serial data output pin. SO2 is the serial data output pin (in 3-wire serial I/O2 mode). |
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