µPD31172
(2) USB Interface Signals
Signal Name
DP (1:2)
I/O
I/O
Function
This is the positive data signal.
This is the negative data signal.
DN (1:2)
I/O
PPON (1:2)
OCI (1:2)
Output
Input
This is the USB route-hub-port power supply control signal.
This is the USB route-hub-port over-current status signal. Make this signal active when the
current flowing through the Vbus line of the USB exceeds the reference value.
IEN
Input
This is the USB buffer input enable signal. Make this signal active when the input signal to the
USB port is validated.
WAKE
Output
Output
Input
This is a wakeup interrupt request signal.
This is a system interrupt request signal.
This is the reset signal for the USB clock.
SMI#
USBRST#
(3) IEEE1284 Interface Signals
Signal Name
CD (0:7)
I/O
I/O
Function
These are data signals
STROBE#
ACK#
I/O
This is the data strobe signal.
This is the acknowledge signal.
This is the busy signal.
I/O
BUSY
I/O
PE
I/O
This is the paper-end signal.
This is the select signal.
SELECT
AUTOFEED#
SLECTIN#
ERROR#
INIT#
I/O
I/O
This is the autofeed signal.
This is the select input signal.
This is the fault signal.
I/O
I/O
I/O
This is the initialization signal.
DIR1284
Output
This signal outputs the transfer direction status.
(4) RS-232-C Interface Signals
Signal Name
RXD
I/O
Function
Input
This is the receive data signal.
CTS#
DSR#
TXD
Input
This is the transmit enable signal.
This is the data set ready signal.
This is the transmit data signal.
This is the transmit request signal.
This is the terminal equipment ready signal.
This is the carrier detection signal.
This is the call display signal.
Input
Output
Output
Output
Input
RTS#
DTR#
DCD#
RI#
Input
9
Data Sheet U14388EJ2V0DS00
NEC [ NEC ]
