how to set RCSTA

[mat janssen]

I use the pic16F876.
In my definition I want to set the RCSTA register to D0 hex.
The compiler does not like this.
When I write:
DEFINE HSER_RCSTA 90H
then it is ok
If I come to A0H or higher the compiler gives an error.
The compiler is PBP2.47
Regards
Mat

[mister_e]

EDIT: forget me if you readed the previous post version

Yeah i got issue here too. so just set all register directly whithout the DEFINEs solve the problem....BUT i didn't check what the A0 value did so, it could be normal

[mat janssen]

Thanks, I did it also like that. But it looks like a small buggiein the compiler!
Regards.
M

[Darrel Taylor]

Hi Mat,

To set the USART to 9-bit mode, use ...

DEFINE HSER_BITS 9

RCSTA will automatically be set to 0D0h
TXSTA will also be set to 60h

HTH,

[mister_e]

i don't know why but my attention was mostely on 'above A0' than on the real purpose ... i just saw that D0.

Too bad, there's some missing conditions in the Macro

[Darrel Taylor]

I think it would also work with a 0 before the D0h in DEFINE HSER_RCSTA.

Don't think there's anything missing. Sometimes it helps to look at the Defaults in the PBPPIC14.lib file.

;****************************************************************
;* Default hardware serial port values                          *
;****************************************************************

    ifndef HSER_BITS
HSER_BITS = 8			; Default to 8 bits
    endif
    ifndef HSER_RCSTA           ; Receive register data
      if (HSER_BITS != 9)
HSER_RCSTA EQU 90h              ; Receiver enabled
      else
HSER_RCSTA EQU 0d0h		; Receiver enabled for 9 bits
      endif
    endif
    ifndef HSER_TXSTA           ; Transmit register data
      if (HSER_BITS != 9)
HSER_TXSTA EQU 20h              ; Transmitter enabled
      else
HSER_TXSTA EQU 60h              ; Transmitter enabled for 9 bits
      endif
    endif