UPD30121 datasheet(13/76 Pages) NEC

13 / 76 page

Data Sheet U14691EJ1V0DS00

µµµµPD30121

(6)

IrDA interface signals

Signal

I/O

Function

IRDIN

This is an IrDA serial data input signal. It is used when the VR4121 sends serial data to the IrDA

controller, for both FIR and SIR. If the IrDA controller used is an HP product, however, this signal should

be used for only SIR.

FIRDIN#/SEL

I/O

This function differs according to the IrDA controller used.

<HP’s controller>

FIRDIN#: It is an FIR receive data input signal.

<TEMIC’s controller>

SEL: It is an output port for external FIR/SIR switching.

<SHARP’s controller>

Use is prohibited.

IRDOUT#

This is the IrDA serial data output signal. It is used when the IrDA controller sends serial data from the

VR4121.

(7)

Debug serial interface signals

Signal

I/O

Function

DDOUT/

GPIO44

This is the debug serial data output signal. It is used when the VR4121 sends serial data to an external

debug serial controller.

When this pin is not used for the DDOUT signal, it can be used as a general-purpose output port.

DDIN/

GPIO45

I/O

This is the debug serial data input signal. It is used when an external debug serial data controller sends

serial data to the VR4121.

When this pin is not used for the DDIN signal, it can be used as a general-purpose output port.

DRTS#/

GPIO46

This is a transmission request signal. The VR4121 asserts this signal before sending serial data.

When this pin is not used for the DRTS# signal, it can be used as a general-purpose output port.

DCTS#/

GPIO47

I/O

This is a transmit acknowledge signal. The VR4121 asserts this signal when it is ready to receive

transmitted serial data.

When this pin is not used for the DCTS# signal, it can be used as a general-purpose output port.

(8)

Keyboard interface signals

Signal

I/O

Function

KPORT (0:7)

This is a keyboard scan data input signal. It is used to scan for pressed keys on the keyboard.

KSCAN (0:11)/

GPIO (32:43)

These signal are used as keyboard scan data output signals and a general-purpose output port. The scan

line is set as active when scanning for pressed keys on the keyboard.

Signals that are not used for KSCAN signals can be used as a general-purpose output port.

(9)

Audio interface signals

Signal

I/O

Function

AUDIOIN

This pin is the audio input signal.

AUDIOOUT

This is an audio output signal. Analog signals that have been converted via the on-chip 10-bit D/A

converter are output.

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