VR4102 datasheet(68/701 Pages) NEC

68 / 701 page

CHAPTER 2 PIN FUNCTIONS

2.2.6 IrDA Interface Signals

These signals are used to control data transmission and reception between the VR4102 and an IrDA controller.

Table 2-6 describes the functions of these signals.

Table 2-6. IrDA Interface Signals

Signal

I/O

Description of function

IRDIN

This is the IrDA serial data input signal. It is used when the VR4102 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 (for how to switch a controller, refer to 24.2.13).

x HP’s controller

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

x TEMIC’s controller

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

x SHARP’s controller

Use is prohibited.

IRDOUT#

This is the IrDA serial data output signal for both SIR and FIR. It is used when the IrDA controller sends

serial data to the VR4102.

2.2.7 Debug Serial Interface Signals

These signals are used to control data transmission and reception between the VR4102 and a external debug

serial controller. Table 2-7 describes the functions of these signals.

Table 2-7. Debug Serial Interface Signals

Signal

I/O

Description of function

DDOUT/

GPIO[44]

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

serial data to the VR4102.

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

DDIN/

GPIO[45]

I/O

This is the debug serial data input signal. It is used when the VR4102 sends serial data to an external

debug serial controller.

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

DRTS#/

GPIO[46]

This is a transmission request signal. The VR4102 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#/

GPIO[47]

I/O

This is a transmit acknowledge signal. The VR4102 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.

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