SPI in CSIH - unable to set PCLK in AP4


I need inputs on how to configure CSIH SPI in AP4 tool , I need 5MHz baud rate for SPI master (CSIH) 

The target MCU is RH850F1k and part number R7F7015834AFP-C whose operation freq is 120 MHz.

there is no option in AP4 I can see to set the PCLK/4 to set the frequency (equal to or lower than PCLK/4)

Can you please suggest options.