RM48L952: Using Program Flash and Flash for emulated EEPROM

Yejung Kim

Part Number: RM48L952

Hi.

I'm currently trying to use Flash memory in RM48L952.

Datasheet shows that the MCU has two kind of memory: 3MB of Program Flash With ECC with 1000 write/erase cycles and 64KB of Flash With ECC for Emulated EEPROM with 100000 write/erase cycles..

1. Is it correct that 3MB flash is for programming and EEPROM emulated flash is for data storing?

2. Is it OK that I still use (part of)3MB flash for data if I need to?

3. If bank width of flash(both 3MB and EEPROM emulated) is 128-bits wide, does that mean writing single byte to flash(in code) results in affecting all 16 bytes, using write cycle of that part?(Is block 16 bytes)

Thank you!

over 3 years ago

0 Yejung Kim over 3 years ago

Intellectual 260 points

I found thread RM48L952: Flash F021 programming Status Error - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums and read it.

So each memory region can be written only once(until whole sector or bank is erased). Programming is done by unit of 64 bits.

Programming and erasing can be done 100000 times.

+1 QJ Wang over 3 years ago

TI__Guru**** 196346 points

Yejung Kim said:
1. Is it correct that 3MB flash is for programming and EEPROM emulated flash is for data storing?

The main flash (3MB) can be used to store the code and execute the code, and it can also be used to store data.

EEPROM is designed to be used as a emulated EEPROM.

Yejung Kim said:
2. Is it OK that I still use (part of)3MB flash for data if I need to?

Yes

Yejung Kim said:
3. If bank width of flash(both 3MB and EEPROM emulated) is 128-bits wide, does that mean writing single byte to flash(in code) results in affecting all 16 bytes, using write cycle of that part?(Is block 16 bytes)

You can program from 1byte up to band width (16 bytes) each time. The the starting address plus the data buffer length can not exceed the bank width. For example, you want to program 14 bytes data to the flash (128 bit wide), starting at address 0x0 is ok, but starting at 0x04 is not allowed.