* src/SDCCglue.c (emitMaps): allow public sfr variables

[fw/sdcc] / doc / sdccman.lyx

diff --git a/doc/sdccman.lyx b/doc/sdccman.lyx
index 8b6f8ed12c22e92cf6f27d65ab4e5cb67bb3eb58..21b011f5c8c86d4a6450116e82796097704ca541 100644 (file)
--- a/doc/sdccman.lyx
+++ b/doc/sdccman.lyx
@@ -14274,14 +14274,34 @@ sfr
 \emph default 
  is where the chip designers decided to put it.
  Needless to say that they didn't agree on a common name either.
- As pdata addressing is used in the startup code for the initialization
- of xdata variables a separate startup code should be used as described
- in section 
+ So that the startup code can correctly initialize xdata variables, you
+ should define an sfr with the name _PAGESFR at the appropriate location
+ if the default, port P2, is not used for this.
+ Some examples are:
+\layout Verse
+
+
+\family typewriter 
+sfr at 0x92 _PAGESFR; /* Cypress EZ-USB family */
+\layout Verse
+
+
+\family typewriter 
+sfr at 0xaf _PAGESFR; /* some Silicon Labs (Cygnal) chips */
+\layout Verse
+
+
+\family typewriter 
+sfr at 0xaa _PAGESFR; /* some Silicon Labs (Cygnal) chips */
+\layout Standard
+
+For more exotic implementations further customizations may be needed.
+ See section 
 \begin_inset LatexCommand \ref{sub:Startup-Code}
 
 \end_inset 
 
-.
+ for other possibilities.
 \layout Subsection
 
 Other Features available by SFR