Renesas R-IN32M3 Series User Manual page 67

R-IN32M3-CL User's Manual
7. Port Functions
7.1 Features

I/O pins: 96

Multiplexed with I/O pin functions of peripheral modules

Input or output can be specified by bit units.
Cautions 1. Switching from a signal for a peripheral module that is multiplexed with a port pin to port
mode might lead to a spike, depending on the state of the pin at the time.
The following general countermeasure for spikes should therefore be implemented in
software.

Switch the pin function while the peripheral function is stopped.

If the multiplexed pin function in use is an interrupt signal, clear the interrupt
request flag and then remove masking of the interrupt.

Only switch the mode after the output value is fixed.
2. Do not externally apply an intermediate voltage to input buffers because these buffers do
not implement through-current countermeasures.
R18UZ0005EJ0400
Dec. 28, 2018
7. Port Functions
Page 57 of 104