reubenn
Junior Member level 1
I read the datasheet of Atmel uC AT89C51.(found here :
http://www.atmel.com/dyn/resources/prod_documents/doc0265.pdf )
According to the datasheet ( pg 10),
Min Max
VIL Input Low-voltage (Except EA) -0.5 0.2VCC - 0.1
VIL1 Input Low-voltage (EA) -0.5 0.2VCC - 0.3
VIH Input High-voltage (Except XTAL1, RST) 0.2VCC + 0.9 VCC + 0.5
VIH1 Input High-voltage (XTAL1, RST) 0.7VCC VCC + 0.5
Taking VCC as +5V
Min Max
VIL -0.5 0.9
VIL1 -0.5 0.7
VIH1 1.9 5.5
VIH1 3.5 5.5
Are these values correct ?
http://www.atmel.com/dyn/resources/prod_documents/doc0265.pdf )
According to the datasheet ( pg 10),
Min Max
VIL Input Low-voltage (Except EA) -0.5 0.2VCC - 0.1
VIL1 Input Low-voltage (EA) -0.5 0.2VCC - 0.3
VIH Input High-voltage (Except XTAL1, RST) 0.2VCC + 0.9 VCC + 0.5
VIH1 Input High-voltage (XTAL1, RST) 0.7VCC VCC + 0.5
Taking VCC as +5V
Min Max
VIL -0.5 0.9
VIL1 -0.5 0.7
VIH1 1.9 5.5
VIH1 3.5 5.5
Are these values correct ?