I would like to set a port pin for example P1.7 to zero "0" on "Power On" condition. I would like to do it in init.a51 or startup.a51. Please let me know how to do it? I am using keil UV2.37. Compiler 7.05 regards Ganesh
this is the old classic. I guess a realy clatters at power on. 1) there is no way to set a pin low during reset. 2) add an inverter to fix it 3) if whatever is connected to the pin is dead slow setting the pin low at startup1 may do it for you. Erik
"3) if whatever is connected to the pin is dead slow..." Wouldn't a relay count as "dead slow" in this context?
Wouldn't a relay count as "dead slow" in this context? I have run relays on when pin high using the following 1) a supervisor that reset for the required time and no more 2) Pn.n = 0 as the first instruction after the jump at 0. Of course, this excludes things like wide tolerance supervisors and RC resets. Erik