5.6.1 EE Data Associated Variables

Variables used to store data from an EE Data read or write must match the types specified in the read/write function prototype, referenced from mcc.h, and found in nvmctrl.h:

uint8_t FLASH_ReadEepromByte(eeprom_adr_t eeprom_adr);
nvmctrl_status_t FLASH_WriteEepromByte(eeprom_adr_t eeprom_adr, uint8_t data);

From stdint.h (also referenced), uint8_t is the same as unsigned char.