Serial communication

[digitalinfo]

Hi,
I have 2 pic.
These are 18f2550 and 16f877.
18f2550 is using usb to communicate with computer that must communicate with 16F877.

Have can i program 2550 to communicate with 877

2550 is using 155200 baud to communicate with pc(for usb)

[PCM programmer]

The 18F2550 could use a software UART or i2c (hardware or software).
Which PIC do you want to be the master (18F2550 or 16F877) ?

[Ttelmah]

You refer to a 'baud rate', but also to USB. USB, does not actually have a 'baud rate'. I suspect the PC communications are actually USB, and in which case the hardware UART, would be available to talk to the other PIC.

The baud rate setting on a USB 'serial port', does not actually control the speed being used. It sends a command to the slave device (in this case the PIC), saying that this is the speed to be 'emulated', and if this device is then talking to the outside world, it can then change the settings on this to match the setting, but the actual comms to the PC, do not 'use' this speed setting anywhere, and the actual transfer here is normally at 12Mbps.

If the hardware UART is available, this will be much less likely to cause problems than trying to use the software UART on a chip handling USB.

So, assuming I'm right, and you are not actually using the hardware serial port, then the anwer is the same as PC programmers, but becomes:

The 18F2550 could use a hardware UART or i2c (hardware or software).

Best Wishes