Data Flash FLASH_EDATAxR_PRG Register Documentation

[Nabidev]

Hello,

In the reference manual rm0481 (stm32h562) in chapters 7.11.38 and 7.11.51 it is stated that EDATAx_STRT Bits do not have any hardware effect. Can I assume that the corresponding bits in FLASH_EDATAxR_CUR are set from option bits only? In that case what is purpose of these bits in FLASH_EDATAxR_PRG? Are rhey also set from option bytes?

What about the EDATAx_EN bit in FLASH_EDATAxR_PRG? Here the documentation is NOT stating that there is NO hardware effect. Is this correct? If yes, where does the actual setting of EDATAx_EN in FLASH_EDATAxR_CUR come from?

By the way in Table 51 there is an DATA_EN1 bit in FLASH_EDATA2R option bytes. May I assume that this is a documentation error and it should in fact be DATA_EN2

Thank you

[KDJEM.1]

Hello @Nabidev ;

The FLASH_EDATAxR_CUR register is read only. This register is non-secure, can be read by both secure and non-secure accesses. This register can be protected against unprivileged access when NSPRIV = 1 in the FLASH_PRIVCFGR register.

FLASH_EDATAxR_PRG register is read write register. This register is non-secure. It can be read and written by both secure and non-secure accesses, and protected against unprivileged access when NSPRIV = 1 in the
FLASH_PRIVCFGR register. It is used to program values in corresponding options bits.

For the question about EDATAx_EN  bit and table 51, I reported internally for checking.

Internal ticket number CDM0062647 (This is an internal tracking number and is not accessible or usable by customers).  

Thank you.

Kaouthar

[KDJEM.1]

Hello @Nabidev;

1. In RM0481 for STM32H562, the bit EDATAx_EN in FLASH_EDATAxR_PRG is a programming field only. It does not directly control hardware immediately.
The actual hardware-effective value is reflected in FLASH_EDATAxR_CUR.EDATAx_EN, which comes from the programmed option-byte value after the flash/option-byte reload sequence. So;
PRG = requested/programmed configuration
CUR = current effective hardware configuration
2. And yes, Table 51 should use DATA_EN2, not DATA_EN1, for FLASH_EDATA2R.

Thank you.

Kaouthar