X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=doc%2Fsdccman.lyx;h=ef0a41a26f0fe767ef4dbcaaf1f0abb8e45ccfe9;hb=f1c40004ae349f7cd3a1a5c5c85f62f695196370;hp=75d1494ef8bb49deac8011ad008494bc1f4b2cd2;hpb=ff4443fc53c2baa488803080c0949f44c6f39844;p=fw%2Fsdcc

diff --git a/doc/sdccman.lyx b/doc/sdccman.lyx
index 75d1494e..ef0a41a2 100644
--- a/doc/sdccman.lyx
+++ b/doc/sdccman.lyx
@@ -1957,6 +1957,21 @@ make install prefix=$(HOME)/local/sdcc
 \layout Standard
 
 Of course this doesn't change the search paths compiled into the binaries.
+\newline 
+
+\newline 
+Moreover the install path can be changed by defining DESTDIR
+\begin_inset LatexCommand \index{DESTDIR}
+
+\end_inset 
+
+:
+\layout LyX-Code
+
+make install DESTDIR=$(HOME)/sdcc.rpm/
+\layout Standard
+
+Please note that DESTDIR must have a trailing slash!
 \layout Section
 
 Search Paths
@@ -10340,6 +10355,41 @@ Since the number of interrupts available is chip specific and the interrupt
 \end_inset 
 
  for details on customizing startup.
+\layout Subsection
+
+Z80 Interrupt Service Routines
+\layout Standard
+
+The Z80 uses several different methods for determining the correct interrupt
+ vector depending on the hardware implementation.
+ Therefore, SDCC ignores the optional interrupt number and does not attempt
+ to generate an interrupt vector table.
+\layout Standard
+
+By default, SDCC generates code for a maskable interrupt, which uses an
+ RETI instruction to return from the interrupt.
+ To write an interrupt handler for the non-maskable interrupt, which needs
+ an RETN instruction instead, add the 
+\emph on 
+critical
+\emph default 
+ keyword:
+\layout Verse
+
+
+\family typewriter 
+void nmi_isr (void) critical interrupt
+\newline 
+{ 
+\newline 
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+...
+ 
+\newline 
+}
 \layout Section
 
 Enabling and Disabling Interrupts