µPD31172
1.4 Recommended Connection of Unused Pins
Connect unused pins as shown in the table below.
Signal Name
Recommended Connection
Pull up
Signal Name
PPON (1:2)
Recommended Connection
Leave open
Pull down
Pull down
Leave open
Leave open
Pull down
Pull down
Pull up
SCLK
AD (0:24)
DATA (0:31)
LCDCS#
RD#
−
OCI (1:2)
IEN
−
Pull up
WAKE
Pull up
SMI#
WR#
Pull up
USBRST#
CD (0:7)
STROBE#
ACK#
LCDRDY
ROMCS (2:3)#
CKE
Leave open
Pull up
Pull down
Pull up
Pull up
UUCAS#
ULCAS#
MRAS (0:1)#
UCAS#
BUSY
Pull down
Pull down
Pull down
Pull up
Pull up
PE
Pull up
SELECT
AUTOFEED#
SELECTIN#
ERROR#
INIT#
Pull up
LCAS#
Pull up
Pull up
IOR#
−
Pull up
IOW#
−
Pull up
RESET
−
DIR1284
RXD
Leave open
Pull down
Pull up
IOCS16#
IOCHRDY
HOLDRQ#
HOLDAK#
SRAS#
−
−
CTS#
Leave open
Pull up
DSR#
Pull up
TXD
Leave open
Leave open
Leave open
Pull up
Pull up
RTS#
SCAS#
Pull up
DTR#
BUSRQ (0:1)#
BUSAK (0:1)#
INTRP
Pull up
DCD#
Leave open
Leave open
Leave open
Leave open
Leave open
Pull up
RI#
Pull up
PS2CLK
PS2DATA
GPIO (0:23)
EXCS (0:5)#
LCDBAK
XIN48M
XOUT48M
CLKOUT48M
Pull up
IRQ
Pull up
USBINT#
PS2INT
Pull down
Leave open
Leave open
Pull up
BUSCLK
ARBCLKSEL
DP (1:2)
DN (1:2)
Pull down
Pull down
Pull down
Leave open
Leave open
Remark Pins with no particular specification (−) cannot be left unconnected.
15
Data Sheet U14388EJ2V0DS00
NEC [ NEC ]
