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Pin 22 (GND) optional Ground
Pin 23 s For interrupts and peripheral modulessee also User’s Manual R18UZ0007EJ1100 chapter 17 Clocked Serial Interface H (CSIH)
Pin 24
Pin 25
Pin 26
Pin 27 has chip select (CS) function for R-IN32M3-EC Clocked Serial Interface H 1 (CSIH1) which works in Slave Mode at CSIHTCSS1 channel 1. The used chip select sink for this R-IN32M3-EC based module is Port P72.
Pin 4 connect the RESETZ ball of R-IN32M3-EC. So an external reset signal can initialize the CPU core and the internal peripheral modules.
Pin 5 complies the MISO function for SPI connection. This pin connect the R-IN32M3-EC CSIH serial data output signal at Port P47 (CSISO0).
Pin 6 complies the MOSI function for SPI connection. This pin connect the R-IN32M3-EC CSIH serial data input signal at Port P46 (CSISI0).
Pin 7 complies the SCK function for SPI connection. This channel 0 CSIH signal connect the serial clock of R-IN32M3-EC at Port P45.