Unassigned Pin Handling - Renesas M16C FAMILY Hardware Manual

Under development
Preliminary specification
Specifications in this manual are tentative and subject to change.
R8C/11 Group

15.2 Unassigned Pin Handling

Table 15.1 lists the handling of unassigned pins.
Table 15.1 Unassigned Pin Handling
Pin name
Ports P0, P1, P3 to
0
P3 , P4
3 5
Ports P4 , P4
6 7
AV , V
CC REF
AV
SS
3
RESET
Notes:
1. When these ports are set for output mode and left open, they remain input mode until they are set for
output mode by a program. The voltage level of these pins may be unstable and the power supply
voltage may increase for the time the ports remain input mode.
The content of the direction registers may change due to noise or runaway caused by noise. In order to
enhance program reliability, set the direction registers periodically by a program.
2. Connect these unassigned pins to the microcomputer using the shortest wire length (within 2 cm)
possible.
3. When power-on reset is used.
Rev.0.91 2003 Sep 08
After setting for input mode, connect every pin to V
or after setting for output mode, leave these pins open
Connect to V via resistor (pull-up)
CC
Connect to V
CC
Connect to V
SS
Connect to V (pull-up)
CC
page 140 of 184
Connection
2
2
15. Programmable I/O Ports 15. Programmable I/O Ports
via a resistor(pull-down);
SS
1, 2
.