topic Help retrieving password from eeprom in Other NXP Products

Help retrieving password from eeprom

scottshaffer — Tue, 01 Feb 2022 06:04:30 GMT

Hello, I have a karaoke machine what I have lost the bios password for and the machine is now locked and unable to use. I have received some help from the original owner in Japan and they have suggested to try to read the eeprom to retrieve the code. Is there a way I can unlock this eeprom chip and reset the chip to reprogram the password or retrieve the password from the chip? Is there a way to find the original *.bin file?

Thank you for your help?

chip: PCF8593

Type:Clock/Calendar

Re: Help retrieving password from eeprom

JozefKozon — Thu, 03 Feb 2022 11:34:07 GMT

Hello Scott,

I have checked the PCF8593 datasheet and this RTC doesn't contain EEPROM. It contains registers, which if no alarm function is used, they can be used as RAM memory. You can access all registers in the PCF8593 by I2C interface.

Please first check the alarm enable bit in Control and Status register, address 00h.

If its 0, then the memory locations 08h to 0Fh are free RAM space and you can read what is in there through the I2C interface.

With Best Regards,

Jozef