Handling Of Unused Pins - Renesas RX100 Series User Manual

RX13T Group
17.5

Handling of Unused Pins

The configuration of unused pins is listed in Table 17.5 .
Table 17.5 Unused Pin Configuration
Pin Name Description
MD (Always used as mode pins)
RES# Connect this pin to VCC via a pull-up resistor.
PE2/NMI Connect this pin to VCC via a pull-up resistor.
P36/EXTAL When the main clock is not used, set the MOSCCR.MOSTP bit to 1 (general port P36).
When this pin is not used as port P36 either, it is configured in the same way as port 1, 2, 7, 9, A, B, D.
P37/XTAL When the main clock is not used, set the MOSCCR.MOSTP bit to 1 (general port P37).
When this pin is not used as port P37 either, it is configured in the same way as port 1, 2, 7, 9, A, B, D.
When the external clock is input to the EXTAL pin, leave this pin open.
 If the direction setting is for input (PORTn.PDR = 0), the corresponding pin is connected to VCC (pulled up)
Ports 1, 2, 7, 9,
Ports A, B, D
 If the direction setting is for output (PORTn.PDR = 1), the pin is released.*
 If the direction setting is for input (PORTn.PDR = 0), the corresponding pin is connected to AVCC0 (pulled
Port 4
 If the direction setting is for output (PORTn.PDR = 1), the pin is released.*
Note 1. Clear the PORTn.PMR bit, the PmnPFS.ISEL bit and the PmnPFS.ASEL bit to 0.
Note 2. In the case of release when the setting is for output, the port is an input over the period from release from the reset state to the
pin becoming an output. Since the voltage on the pin is undefined while it is an input, this may lead to an increase in the current
drawn.
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
via a resistor or to VSS (pulled down) via a resistor.*
up) via a resistor or to AVSS0 (pulled down) via a resistor.
1
1, 2
*
1, * 2
17. I/O Ports
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