455A Datasheet, PDF (7/148 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

455A Group
CONNECTIONS OF UNUSED PINS
Table 6 Port function
Pin
Connection
Usage condition
XIN
Connect to VSS.
−
XOUT
Open.
−
XCIN/D6
Connect to VSS.
Pull-up transistor is OFF.
The key-on wakeup function is invalid.
XCOUT/D7
Open.
The key-on wakeup function is invalid.
D0−D4
Open.
The key-on wakeup function is invalid.
Connect to VSS.
N-channel open-drain is selected for the output structure.
Pull-up transistor is OFF.
The key-on wakeup function is invalid.
D5/INT
Open.
INT pin input is disabled.
The key-on wakeup function is invalid.
Connect to VSS.
N-channel open-drain is selected for the output structure.
Pull-up transistor is OFF.
The key-on wakeup function is invalid.
C/CNTR
Open.
CNTR input is not selected for timer 1 count source.
P00/SEG16− Open.
P03/SEG19 _{Connect to VSS.}
The key-on wakeup function is invalid.
Segment output is not selected.
N-channel open-drain is selected for the output structure.
Pull-up transistor is OFF.
The key-on wakeup function is invalid.
P10/SEG20− Open.
P13/SEG23 _{Connect to VSS.}
The key-on wakeup function is invalid.
Segment output is not selected.
N-channel open-drain is selected for the output structure.
Pull-up transistor is OFF.
The key-on wakeup function is invalid.
P20/SEG24− Open.
P23/SEG27 _{Connect to VSS.}
The key-on wakeup function is invalid.
Segment output is not selected.
N-channel open-drain is selected for the output structure.
Pull-up transistor is OFF.
The key-on wakeup function is invalid.
P30/SEG28− Open.
P33/SEG31 _{Connect to VSS.}
The key-on wakeup function is invalid.
Segment output is not selected.
N-channel open-drain is selected for the output structure.
Pull-up transistor is OFF.
The key-on wakeup function is invalid.
COM0–COM3 Open.
−
SEG0/VLC3 Open.
SEG0 pin is selected.
SEG1/VLC2 Open.
SEG1 pin is selected.
SEG2/VLC1 Open.
SEG2 pin is selected.
SEG3–SEG15 Open.
−
(Note when connecting to VSS or VDD)
Connect the unused pins to VSS using the thickest wire at the shortest distance against noise.
Rev.1.01 Feb 15, 2008 Page 7 of 146
REJ03B0224-0101