Keil forum AT89S51 LEDs test question ..

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AT89S51 LEDs test question ..

Sean Shui over 12 years ago

hi

I am testing LEDs with AT89S51 P1 pins .

Could I just connect P1.0 and P1.1 pins by 2 LEDs , or should I connect all P1.x pins ?

Should I connect RST pin ? Could I just connect Vcc and GND pins ?

I set P1 = 0x02 but get both LEDs on , not only P1.1 LED , do you know what's wrong ?

Thank for your guiding .

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0 Sean Shui over 12 years ago in reply to ImPer Westermark

hi

Could I save RST and clock PINs connection ?

I just want to test IO port and blink the LEDs.

But not matter I add RST , or assign P0_1 P0_2 P0_3 P0_4 1 or 0 , P0 LEDs are always on.

I wonder if I did not flash AT89S51 firmware correctly .

Thank for you guiding .
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0 Sean Shui over 12 years ago in reply to ImPer Westermark

hi

Could I save RST and clock PINs connection ?

I just want to test IO port and blink the LEDs.

But not matter I add RST , or assign P0_1 P0_2 P0_3 P0_4 1 or 0 , P0 LEDs are always on.

I wonder if I did not flash AT89S51 firmware correctly .

Thank for you guiding .
Cancel
Vote up 0 Vote down

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