Renesas R-IN32M3 Series User Manual page 195

R-IN32M3-EC User's Manual
8. Port Function
8.1 Features
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Number of I/O ports: 96
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Can function alternately as the I/O pins of other peripheral functions.
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Input or output can be specified by bit unit.
Cautions 1. Switching from a signal for a peripheral module that is multiplexed with a port pin to port
mode by changing the PMCn register setting 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.
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Switch the pin function while the peripheral function is stopped.
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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.
R18UZ0003EJ0501
Jan. 12, 2021
8. Port Function
Page 182 of 224