RL78 Family VDE Certified IEC60730/60335 Self Test Library
R01AN0749EG0201 Rev.2.01 Page 43 of 50
Mar 04, 2014
6 Additional Hardware Resources
The following additional safety and self test features have been included in the RL78 series to provide support for
the user. While these additional functions have not been certified by VDE, they provide a valuable extra resource to
the user and are included here for reference.
6.1 Additional Safety Functions
The following additional safety functions have been included in the RL78 series MCU devices.
6.1.1 RAM Memory Parity Generator Checker
When enabled the function includes a parity check for each byte written to any location of the RAM
memory area. The Parity is generated when data is written to the Ram memory and checked when a location
is read from memory.
Please note that this function is available only for data accesses and does not apply to code executed from
Ram.
If a Ram parity error is detected, then an internal Reset is generated. The Reset source can be determined by
examining the “RESF” register. The “IAWRF” bit will be set if the invalid memory access was the source of
the Reset.
Figure 21 RAM Parity Error Checking
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