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PORTC Pins

Question asked by Ray Hall on Mar 30, 2015
Latest reply on Apr 3, 2015 by Martin35804

I am using the 144 pin MC9S12XEP100.

 

PORTC pins do not work when set as outputs and toggled. They just stay on 5 volts all the time. Adding a 10k pullup makes no difference.

 

Other port pins like PORTD work as expected. I looked at the datasheet to see if PORTC has some other function that I need to turn off. I could only find this. What am I missing ?

 

1.2.3.10 PC[7:0] / DATA [15:8] — Port C I/O Pins

 

PC[7:0] are general-purpose input or output pins. In MCU expanded modes of operation, these pins are

used for the external data bus.

 

The input voltage thresholds for PC[7:0] can be configured to reduced levels, to allowdata from an external

3.3-V peripheral to be read by the MCU operating at 5.0 V. The input voltage thresholds for PC[7:0] are

configured to reduced levels out of reset in expanded and emulation modes. The input voltage thresholds

for PC[7:0] are configured to 5-V levels out of reset in normal modes.

 

Ray.

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