Downgrading from SX52 to SX48 and PORTA

oberg3

With the downgrading from SX52 to SX48, I am obviously losing the high nibble of port A.

I have code similar to the following, with port a set to outputs:

MOV $05,#$FF

If I were to test pins 4-7 using SB or SNB, would it be accurate?

Thanks,
Mark

Nate

I would·assume that they would be valid...... but at risk of being·considered flippant, why don't you give it a try and tell us?

Nate

oberg3

I currently do not own the device. The simulator claims it works.

Bean

Mark,
Yes, If the pins are set to output, they will read-back the value they are set.

Bean.

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Paul Baker

Bean is correct, the bits are there, they just arn't connected to anything on the outside of the chip, so you can use them as general purpose bits in your program as flags, or other needs. Be sure to configure it to output first as Bean has said.

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oberg3

Thanks