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UPD784938 Datasheet(PDF) 57 Page - NEC |
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UPD784938 Datasheet(HTML) 57 Page - NEC |
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57 / 733 page  CHAPTER 2 PIN FUNCTIONS 57 Preliminary User’s Manual U13987EJ1V0UM00 (iii) CI (Clock Input) The timer/event counter 2 external clock input pin. (iv) ASCK (Asynchronous Serial Clock) The external baud rate clock input pin. (v) SCK1 (Serial Clock) The serial clock input/output pin (in 3-wire serial I/O1 mode). (vi) SI0 (Serial Input 0) The serial data input pin (in 3-wire serial I/O0 mode). (4) P30 to P37 (Port 3) ... 3-state input/output Port 3 is an 8-bit input/output port with an output latch. Input/output can be specified bit-wise by setting the port 3 mode register (PM3). Each pin incorporates a software programmable pull-up resistor. P32 and P33 can be set in the N-ch open- drain mode. In addition to its function as an input/output port, port 3 also has various control signal pin alternate functions. The operation mode can be specified in 1-bit units by setting the port 3 mode control register (PMC3), as shown in Table 2-3. The pin level of any pin can always be read or tested regardless of the alternate-function operation. When RESET is input, port 3 is set as an input port (output high-impedance state), and the output latch contents are undefined. Table 2-3. Port 3 Operation Modes (n = 0 to 7) Mode Port Mode Control Signal Input/Output Mode Setting Condition PMC3n = 0 PMC3n = 1 P30 Input/output port RxD input / SI1 input P31 TxD output / SO1 output P32 SCK0 input/output P33 SO0 output P34 TO0 output P35 TO1 output P36 TO2 output P37 TO3 output (a) Port mode Each port specified as port mode by the port 3 mode control register (PMC3) can be specified as input/output in 1- bit units by setting the port 3 mode register (PM3). (b) Control signal input/output mode Pins can be set as control pins in 1-bit units by setting the port 3 mode control register (PMC3). (i) RxD (Receive Data) /SI1 (Serial Input 1) RxD is the asynchronous serial interface serial data input pin. SI1 is the serial data input pin (in 3-wire serial I/O1 mode). |
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