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Renesas RH850 / P1x-C: UMI Error, R_FAD_ERR_CLOCK The CPU clock frequency is incorrect

07-Mar-2023

The CPU clock is determined by the PLL0 parameters in OPBT1. Factory default value is 0xBFFFC938, which cannot be used for Flash programming using UMI. 


Possible solution:

The Option byte OPBT1 PLL and Clock divider settings must be changed following RH850/P1x-C User's Manual device specifications. For example, the P1H-C factory default is 0xBFFFC938, however, a better setting is 0xBFFFC9D8.

Similar limitation exists on P1L-C where the OPBT1 factory default value is 0xBFFFC939. Valid value is for example 0xBFFFC938.


P1x-C devices start at full speed from a PLL that's defined by OPBT1. Follow the User's Manual closely. An incorrect setting can make the device inoperable.


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