Renesas RL78 Series User Manual page 755

RL78/G1D
23.1 Overview of Safety Functions
The following safety functions are provided in the RL78/G1D to comply with the IEC60730 and IEC61508 safety
standards.
These functions enable the microcontroller to self-diagnose abnormalities and stop operating if an abnormality is
detected.
(1) Flash memory CRC operation function (high-speed CRC, general-purpose CRC)
This detects data errors in the flash memory by performing CRC operations.
Two CRC functions are provided in the RL78/G1D that can be used according to the application or purpose of use.
● High-speed CRC: The CPU can be stopped and a high-speed check executed on its entire code flash memory
● General CRC:
(2) RAM parity error detection function
This detects parity errors when reading RAM data.
(3) RAM guard function
This prevents RAM data from being rewritten when the CPU freezes.
(4) SFR guard function
This prevents SFRs from being rewritten when the CPU freezes.
(5) Invalid memory access detection function
This detects illegal accesses to invalid memory areas (such as areas where no memory is allocated and areas to
which access is restricted).
(6) Frequency detection function
This function allows a self-check of the CPU/peripheral hardware clock frequencies using the timer array unit.
(7) A/D test function
This is used to perform a self-check of the A/D converter by performing A/D conversion of the A/D converter's positive
and negative reference voltages, analog input channel (ANI), temperature sensor output voltage, and internal
reference voltage.
Remark For usage examples of the safety functions complying with the IEC60730 safety standards, refer to the
RL78 MCU series IEC60730/60335 application notes (R01AN1062, R01AN1296).
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
CHAPTER 23 SAFETY FUNCTIONS
area during the initialization routine.
This can be used for checking various data in addition to the code flash memory area while the
CPU is running.
CHAPTER 23 SAFETY FUNCTIONS
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