Author Topic: P89C669BBD Switch to ISP mode problem  (Read 4898 times)

Dmitry Verevkin

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P89C669BBD Switch to ISP mode problem
« on: September 18, 2008, 09:57:53 am »
Hello All
Please can anybody tell me - how can I switch to ISP mode my P89C669BBD or P89C60X2 chip?
I use RS-232 interface. Device is not answer to requests.
 

Andy Ayre

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Re: P89C669BBD Switch to ISP mode problem
« Reply #1 on: September 19, 2008, 08:24:31 am »
It is typically achieved by holding the /PSEN signal during reset. Check the flash section of the user manual from NXP for a definitive answer.

Andy
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