Author Topic: RESET circuit for NXP P89C61X2 microcontroller  (Read 6910 times)

rajesh279

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RESET circuit for NXP P89C61X2 microcontroller
« on: February 19, 2012, 09:52:20 pm »
Hi,
I am using Flashmagic to program P89C61X2BN microcontroller through ISP. There is no RESET circuit available on board.
Can anyone please provide me a RESET circuit to RESET the controller in ISP mode before using Flashmagic ?

Regards
R.S.

Andy Ayre

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Re: RESET circuit for NXP P89C61X2 microcontroller
« Reply #1 on: February 20, 2012, 12:10:59 am »
Typically reset circuits are a capacitor and resistor or an external watchdog device. Then you just need a jumper or switch on the ISP entry pin per the device user manual.

Andy
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rajesh279

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Re: RESET circuit for NXP P89C61X2 microcontroller
« Reply #2 on: February 21, 2012, 05:52:10 am »
Please see the attached circuit. The pin 11,12 and 13 of LS245 is connected to STCP, SHCP and DS pin respectively of 74HC595.