Cannot change the option byte AFR7 for beeper using STVP

[Lei Sun]

Posted on July 23, 2017 at 17:20

Hi all,

i'm currently using STM8S003K3 and want to change the option byte for the beeper using STVP. But after I connected the discovery board to my PC, I can't change AFR7 because it is ''reserved''. 

Anyone know what I'm doing wrong? Thanks.

Bo

#option-bytes #beeper #stm8s003k3 #stvp

[Szymon PANECKI]

Posted on July 24, 2017 at 09:07

Hello Lei,

In order to provide you the answer, let me refer to MCU's

http://www.st.com/resource/en/datasheet/stm8s003k3.pdf

. This is correct, that AFR7 bit from Option Bytes region is responsible for beeper. However if we refer to more detailed information in mentioned document, we can notice that:

• in Table 14, which desribes Option Bytes for STM8S003K3, AFR7 is reserved.

• in Table 15, which desribes Option Bytes for STM8S003F3, AFR7 can be reconfigured.

If we use STVP and select at the beginning STM8S003F3 and then STM8S003K3, the result is the same: STM8S003F3 allows to change value of AFR7 and STM8S003K3 doesn't allow to change AFR7.

So as a result there is nothing wrong, which you do. Simply the diveice, which you use, doesn't support this feature.

Regards

Szymon