CHAPTER 2 PIN FUNCTIONS
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2.2.6 IrDA Interface Signals
These signals are used to control data transmission and reception between the V
R
4102 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
I
This is the IrDA serial data input signal. It is used when the V
R
4102 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#
O
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 V
R
4102.
2.2.7 Debug Serial Interface Signals
These signals are used to control data transmission and reception between the V
R
4102 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]
O
This is the debug serial data output signal. It is used when an external debug serial data controller sends
serial data to the V
R
4102.
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 V
R
4102 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]
O
This is a transmission request signal. The V
R
4102 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 V
R
4102 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.