UPD17708 datasheet(288/356 Pages) NEC

288 / 356 page

288

µPD17704, 17705, 17707, 17708, 17709

19.2 I/O Selection Block and Output Selection Block

The I/O selection block selects the input or output mode of the P1D0/BEEP0 and P1D1/BEEP1 pins by using the

port 1D bit I/O selection register. Set the pin to be used as a BEEP pin in the output mode.

The output selection block sets the P1D0/BEEP0 and P1D1/BEEP1 pins in the general-purpose output port mode

or BEEP output mode by using the BEEP/general-purpose port pin function selection register.

Figure 19-2 shows the configuration of the port 1D bit I/O selection register.

Figure 19-3 shows the configuration of the BEEP/general-purpose port pin function selection registerion.

Figure 19-2. Configuration of Port 1D Bit I/O Selection Register

Name

Flag symbol

Address

(BANK15)

6CH

Read/Write

R/W

Port 1D bit I/O selection

Power-ON reset

WDT&SP reset

CE reset

Clock stop

Sets P1D0/BEEP0 pin in input mode

Sets P1D0/BEEP0 pin in output mode.

Selects input or output port mode

Sets P1D1/BEEP1 pin in input mode

Sets P1D1/BEEP1 pin in output mode

Selects input or output port mode

Sets P1D2 pin in input mode

Sets P1D2 pin in output mode

Selects input or output port mode

Sets P1D3 pin in input mode

Sets P1D3 pin in output mode

Selects input or output port mode

Retained

UPD17708 데이터시트(PDF) 288 Page - NEC