Does any one know why PORT0.27 at LPC1768 is open drain?when i add
external 10k pull up resistor then this pin work properly but when i
remove external resistor it doesnt work and for example if i apply
high level via LPC_GPIO0->FIOSET|=(1<<27); then this
pin goes to 0.3volt instead of 3.3volt and when apply low level via
LPC_GPIO0->FIOCLR|=(1<<27); it goes to 0 volt.
I enable chip pull up resistor on this pin but it seems doesnt
work.What should i do?
The designers of the chip would know - but it has nothing to do
So you need to ask NXP
 Pins P0 and P0 are open-drain for I2C-bus compliance.
>>I enable chip pull up resistor on this pin but it seems
doesnt work.What should i do?
Reading the manual and catching the nuances is what most of us try to
do before going to board design.
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