topic Re: P&E Micro USB Multilink problem with MC908QG8 in 8-bit Microcontrollers

P&E Micro USB Multilink problem with MC908QG8

paul_1951 — Sun, 23 Aug 2015 15:40:36 GMT

Hi,

We have a rev. C USB Multilink. P/N is USB-ML-12E. We have been using it several years successfully with a custom designed eval board that has a MC908QG4 part. It has wire wrap headers and a 3 volt regulator on board. Recently I changed the part to a MC908QG8. With the latest version of CodeWarrior open when I connect the 2x3 connector from the Multilink the blue LED is on but the yellow flashes on for a half second and goes out. When I try to flash the part CodeWarrior says there is a connection error. I have changed the QG8 part several several times and the yellow LED never stay on solid. I have verified 3 volts on the BDM connector on the board. We are right in the middle of a project and urgently need help.

Thanks,

Paul

Re: P&E Micro USB Multilink problem with MC908QG8

Rick_Li — Wed, 26 Aug 2015 03:03:27 GMT

Hi Paul,

I would highly suggest checking the BDM circuit on your target board.

The attached is the schematic of DEMO9S08QG8, to be frank, even only connect pin 1,2,4,6 to the target MCU (MC9S08QG8), both LEDs on USB-Multilink should light and the application can also be programmed!

Re: P&E Micro USB Multilink problem with MC908QG8

paul_1951 — Mon, 31 Aug 2015 02:04:36 GMT

Hi Yong,

This was a custom demo board I designed. I have come to the conclusion the parts are bad and are getting them replaced.

Thanks for your response.

Paul