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VP998 read and write problem Reply  
handsome
fatih35m
 Hello, I asked on your forum but did not receive a reply.
I want to read and write the Fujitsu MB95F398K QFP48 pin MCU via ISP, but I keep getting “could not read” or “could not write” errors. The connections are correct — VCC, GND, RESET, and DBG are connected. I need to solve an urgent problem, so please help. Thank you.
Video link:

https://uploadnow.io/s/1e142285-b950-498b-aaed-e8150e0a97e4

[ The message is modified by fatih35m ]
Go back list [ Posted:2025-08-12 22:04:13 ] Edit Administer top

Re:VP998 read and write problem Reply  
handsome
lxl
 please send error photo to weilong@weilei.com.cn
Go back list [ Posted:2025-08-19 11:22:04 ] Edit Administer Top

Re:VP998 read and write problem Reply  
handsome
fatih35m
 I sent it a few days ago but received no response.
Go back list [ Posted:2025-08-25 19:18:15 ] Edit Administer Top

Re:VP998 read and write problem Reply  
handsome
lxl
 We do not received the error photos.
Go back list [ Posted:2025-08-26 13:38:47 ] Edit Administer Top

Re:VP998 read and write problem Reply  
handsome
fatih35m
 I sent the error video link both by email and here
If you have the opportunity to watch the video in the link, everything is clearly explained in the video.
Go back list [ Posted:2025-08-26 14:52:06 ] Edit Administer Top

Re:VP998 read and write problem Reply  
handsome
lxl
 If the communication between the programmer and the chip is abnormal, an information reading error or writing error will occur.
Possible reasons：
1. ISP connection error.
2. Data line DBG is disturbed.
3. The power supply of the circuit board where the chip is located is overloaded, and it requires independent power supply.
Go back list [ Posted:2025-08-29 06:07:11 ] Edit Administer Top

Re:VP998 read and write problem Reply  
handsome
fatih35m
 I removed the processor from the board and connected it directly to the programmer’s ISP port without anything in between. I tried to read it, but I got the same error again. Now I want to ask: could the Wellon’s DBG line be faulty?
Go back list [ Posted:2025-09-01 04:56:09 ] Edit Administer Top

Re:VP998 read and write problem Reply  
handsome
lxl
 our test is ok! ISP wiring error, incorrect wiring or the chip has been encrypted.
Go back list [ Posted:2025-09-04 12:51:31 ] Edit Administer Top
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