Keil forum 3x4 key pad

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3x4 key pad

arfai john over 20 years ago

Hi, if a 3x4 keypad is connected to port 0 of 89c51. all pins on port 0 need to connect pull up resistor or not?

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0 erik malund over 20 years ago

if a 3x4 keypad is connected to port 0 of 89c51. all pins on port 0 need to connect pull up resistor or not?
no answer possible because
derivative not specified
method not specified

Erik
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0 erik malund over 20 years ago

if a 3x4 keypad is connected to port 0 of 89c51. all pins on port 0 need to connect pull up resistor or not?
no answer possible because
derivative not specified
method not specified

Erik
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0 Andy Neil over 20 years ago in reply to erik malund

"no answer possible"

Rubbish!

Two answers are possible:

1. Yes.

2. No.
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0 erik malund over 20 years ago in reply to Andy Neil

OK, you win
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