understand mmw command

[vrai]

Question: I have an example here that assign TRACE_IOEN and TRACE_MODE to sync 1 bit from the DBGMCU_CR register (Address: 0xE004 2004) by using this command: mmw 0xE0042004 0x00000060 0x000000c0.

 What the 0x000000c0 doing in the mmw command ?

my basic understanding for mmw is this: mmw address setbits clearbits

Thanks

image from reference manual of stm32f4:

 

 

 

 

[vrai]

This is how mmw work:

 

mmw 0xE0042004 0x00000060 0x000000c0 is similar to this:

mmw address setbits clearbits  where the new_val = (old_val & ~clearbits) | setbits]

Result: new_val = (old_val_is & ~0x000000c0) | 0x00000060

 

mmw 0xE0042004 0x00000060 0x000000c0 is similar to this as well:

DBGMCU_APB1_FZ &= ~0x000000c0
DBGMCU_APB1_FZ |= 0x00000060