Hi!
I am using an Adapt9s12e128 (for Motorola MC9S12E128) from Technological Arts without BDM.
I am trying to use PORT Q as outputs to control LEDs. PMF is disabled. However, I am having some problem with bit 6 of this port.
If I set every bit in this port(Q6-Q0) to 1, with Metrowerks' real time debugger, I can see PORT Q I/O register PTQ is 0x7F. However, PORT Q input register PTIQ shows 0x3F. And if I measure the voltage at this pin, it's 1.35V instead of 5V.
It works normally when set to 0.
I checked on the schematics of Adapt9s12e128 and nothing is connected to this pin.
What could be the cause of this?
Any comments/help is greatly appreciated!
Amy