On Sun, 13 Jan 2013 13:23:23 +0100
al_bin <al_...@vp.pl> wrote:
> W dniu 2013-01-13 09:53:00 użytkownik Molnár Károly <prot...@freemail.hu>
> napisał:
> ...
> > Something left out of the calculation. In the case of TMRx, differ the read
> > and write sequence.
> > write: first TMRxH, second TMRxL
> > read: first TMRxL, second TMRxH
> >
>
> :-)
>
> As for mcs51:
> SDCC manual (http://sdcc.sourceforge.net/doc/sdccman.pdf) ch. 3.4.1.7
>
>
> "16 Bit and 32 bit special function register combinations which require a
> certain access order are better not declared
> using __sfr16 or __sfr32. Allthough SDCC usually accesses them Least
> Significant Byte (LSB) first, this is not
> guaranteed."
>
> Albert
>
This would be good for a new type: __sfr16_t --- "t" -> timer
Perhaps even these will: __sfr16_be --- "be" -> big-endian
__sfr16_le --- "le" -> little-endian
Otherwise, I now updated the PIC16 branch (device and include files). From now
on use the __ sfr16
type. Due to the above to TMRx registers, no sfr16. Two examples of the
realization:
.....................................
__at(0x0FC3) __sfr ADRES;
__at(0x0FC3) __sfr ADRESL;
__at(0x0FC3) __sfr16 ADRESw;
__at(0x0FC4) __sfr ADRESH;
.....................................
__at(0x0FD9) __sfr FSR2L;
__at(0x0FD9) __sfr16 FSR2w;
__at(0x0FDA) __sfr FSR2H;
.....................................
Károly
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