Is it possible to send 0x000 via usart?

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shaun_c_m

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is it possible to send 0x000 via usart?

im using the 9 bit mode on the 16f877, but with all bits set to 0 the module seems to consider the buffer empty and doesnt send any data.

is it possible to trigger the module by using another command like a swapf or add?

thanks
 

0x000 via usart

Any movwf to the TXREG register will initiate a transmit.

9bit mode is pretty much not for RS232, you'll need special software on the PC end if that's what you're trying to talk to. I'm not sure the a standard PC UART supports 9 bit.
 

Re: 0x000 via usart

If you need to send 0x0000, you need to transmit 16bis->2bytes

Simple transmit 2 bytes and in the receptor put it in the right place in memory.

I had a similar problem, I needed to send 16bit unsigned integers to a PC, I simple send the 2 bytes(from PIC RAM) by RS232 to a PC, and in the PC soft I put the 2 bytes in RAM addresses of a unsigned int.
 

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