write to a DSPIC port a Byte

[João Gonçalves]

Hello, I'm starting to use DSPICs, and I'm trying to write a byte into a port (old output_x in PICs). My question is how can i write a single byte (from x0 to x7) without changing the others register (from x8 to x15).
Thank you.
best regards,
João

[Guest_7068]

You should be able to use the make16 function within the output_x function, something like:

[João Gonçalves]

Perhaps I didn't explain my self very well. In fact i want to do exactlly the oposite. using only 8 byte of the 16 register, whithout affecting the upper half.
Thank you
Best regards,

[Ttelmah]

Haven't played with the DSPic's under CCS yet, but some comments may help.
On most other 16bit chips, if you want to output a byte on a 16bit port, you do a 16bit read, modify the bits you want to send, and perform a 16bit write.
The DSPics do support an 8bit 'reverse compatible' mode for accessing single bytes, but I don't know if this works with the I/O registers. You should be able to test and find out. The #byte operator still exists, so try allocating a variable with this to the low byte register address, and see what happens!...

Best Wishes