topic s08 can't work,and BKGD is zero always in 8-bit Microcontrollers

s08 can't work,and BKGD is zero always

zhuwei — Tue, 05 Nov 2019 16:14:26 GMT

Anybody can help me? I found one chip can't work after download S19 files, but others are work well. I found the voltage about the BKGD was low always ,when I check the BKGD pin ,The chip's name is 9S08DZ60 64PIN

Re: s08 can't work,and BKGD is zero always

vicentegomez — Tue, 05 Nov 2019 22:36:52 GMT

Are you using any NXP evaluation boar or you are using your own design? can you check that there is not any manufacturing issue? you are able to program the part?

only one unit is the problem?

regards

Vicente

Re: s08 can't work,and BKGD is zero always

zhuwei — Wed, 06 Nov 2019 00:48:11 GMT

Thanks for your help. I am using our's design board. And I also check the board about the manufacture issues. I can't program the chip with the BDM. I just found the only one right now.

Re: s08 can't work,and BKGD is zero always

vicentegomez — Thu, 07 Nov 2019 15:42:56 GMT

Are you using a usb multilink to programming or the cyclone? can you perform a mass erase?

Please let me know more information about the problem

have a good day

Vicente

Re: s08 can't work,and BKGD is zero always

zhuwei — Mon, 11 Nov 2019 16:14:07 GMT

Thanks for your reply. I had tried to program the chip with S08 BDM ,and it can't connect to pc ,so it can't perform erase. I have no multilink or the cyclone.

Addtion: the chip work well in the manufacture room ,Maybe damaged when the product be installed to the truck. But we do not know what reason can cause the chip be damaged .When I replace the chip,it works stably and reliably.

Re: s08 can't work,and BKGD is zero always

vicentegomez — Tue, 12 Nov 2019 15:50:08 GMT

Can you check if the BKGB pin has a low impedance or short, maybe it was damaged by an over-voltage or current.

Regards