4552 Datasheet, PDF (7/145 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4552 Group
CONNECTIONS OF UNUSED PINS
Pin
Connection
XIN
Connect to VSS.
XOUT
Open.
XCIN/D6
Connect to VSS.
XCOUT/D7
Open.
D0–D4
Open.
Connect to VSS.
D5/INT
Open.
Connect to VSS.
C/CNTR
Open.
P00/SEG21–
Open.
P03/SEG24
Connect to VSS.
P10/SEG25–
P13/SEG28
Open.
Connect to Vss.
P20/SEG17–
P23/SEG20
Open.
Connect to Vss.
COM0–COM3
SEG0/VLC3
SEG1/VLC2
SEG2/VLC1
SEG3–SEG16
(Note)
Open.
Open.
Open.
Open.
Open.
Note: SEG13 pin is not existed in the 4552 Group.
RC oscillator is not selected
Usage condition
N-channel open-drain is selected for the output structure.
INT pin input is disabled.
N-channel open-drain is selected for the output structure.
CNTR input is not selected for timer 1 count source.
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.
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.
Segment output is not selected.
N-channel open-drain is selected for the output structure.
SEG0 pin is selected.
SEG1 pin is selected.
SEG2 pin is selected.
(Note when connecting to VSS and VDD)
q Connect the unused pins to VSS and VDD using the thickest wire at the shortest distance against noise.
Rev.3.02 Dec 22, 2006 page 7 of 142
REJ03B0023-0302