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Using SSI or SSO as programmable I/O port for CMOS output

Latest Updated:10/05/2016

Question:

In the "Association between Communication Modes and I/O Pins" table in the user's manual/hardware manual, it is indicated that the SSI and SSO pins may be used as programmable I/O ports when using the synchronous serial communication unit (SSU).
At this time, is it possible to use a pin that is used as an programmable I/O port for CMOS output (SOOS bit of SSMR2 register is 0)?

Answer:

When the SSI or SSO pin is used as a programmable I/O port when using the SSU, it cannot be used for CMOS output.
When the SOOS bit is set to 0 (CMOS output), please use it as an input port.
When the SOOS bit is set to 1 (N-channel open drain output), it can be used as an output port.
Suitable Products
R8C/32C
R8C/33C
R8C/34C
R8C/35C
R8C/36C
R8C/38C
R8C/3GC
R8C/3JC
R8C/32M
R8C/33M
R8C/34M
R8C/35M
R8C/36M
R8C/38M
R8C/3GM
R8C/3JM
R8C/3MK
R8C/34K
R8C/3MU
R8C/34U
R8C/3MQ
R8C/L35C
R8C/L36C
R8C/L38C
R8C/L3AC
R8C/L35M
R8C/L36M
R8C/L38M
R8C/L3AM
R8C/LA3A
R8C/LA5A
R8C/LA6A
R8C/LA8A
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