UPD30121 NEC [NEC], UPD30121 Datasheet - Page 13

• Manufacturer Part Number: UPD30121
• Description: VR4121TM 64-/32-BIT MICROPROCESSOR
• Manufacturer: NEC [NEC]

IRDIN
FIRDIN#/SEL
IRDOUT#
KPORT (0:7)
KSCAN (0:11)/
GPIO (32:43)
DDOUT/
GPIO44
DDIN/
GPIO45
DRTS#/
GPIO46
DCTS#/
GPIO47
AUDIOIN
AUDIOOUT
(6) IrDA interface signals
(7) Debug serial interface signals
(8) Keyboard interface signals
(9) Audio interface signals
Signal
Signal
Signal
Signal
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
O
O
O
O
I
I
I
This is an IrDA serial data input signal. It is used when the V
controller, for both FIR and SIR. If the IrDA controller used is an HP product, however, this signal should
be used for only SIR.
This function differs according to the IrDA controller used.
<HP’s controller>
<TEMIC’s controller>
<SHARP’s controller>
This is the IrDA serial data output signal. It is used when the IrDA controller sends serial data from the
V
This is a keyboard scan data input signal. It is used to scan for pressed keys on the keyboard.
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.
This pin is the audio input signal.
This is an audio output signal. Analog signals that have been converted via the on-chip 10-bit D/A
converter are output.
This is the debug serial data output signal. It is used when the V
debug serial controller.
When this pin is not used for the DDOUT signal, it can be used as a general-purpose output port.
This is the debug serial data input signal. It is used when an external debug serial data controller sends
serial data to the V
When this pin is not used for the DDIN signal, it can be used as a general-purpose output port.
This is a transmission request signal. The V
When this pin is not used for the DRTS# signal, it can be used as a general-purpose output port.
This is a transmit acknowledge signal. The V
transmitted serial data.
When this pin is not used for the DCTS# signal, it can be used as a general-purpose output port.
R
4121.
FIRDIN#: It is an FIR receive data input signal.
SEL: It is an output port for external FIR/SIR switching.
Use is prohibited.
R
4121.
Data Sheet U14691EJ1V0DS00
R
4121 asserts this signal before sending serial data.
R
4121 asserts this signal when it is ready to receive
Function
Function
Function
Function
R
4121 sends serial data to the IrDA
R
4121 sends serial data to an external
PD30121
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