I want to use uart 3 port on PIC24FJ256GB110

[pigsweet]

I read CCS 4.084. it can use 2 Uart. but the PIC24FJ256 has 4 port and I want to use 3 uart. How to use. How to write. And Who it khow please.
let.s me khow. Thank you so much please..............................

[FvM]

As previously repoprted, CCS wasn't able yet to supply a devices.dat and device include file, that gives full support of PIC24FJ128GA parts. They have forgotten e.g. UART 3 and 4. You can use the Device Editor tool to supplement the missing interrupt information and add the SFR definitions to the device file manually. Or, simply specify PIC24FJ128GBxxx.

I just realized, that I didn't read your post thorougly, as you are already talking of the xxxGB chip. You have to define the respective SFR and functions by yourself, e.g.: