Follow-up Comment #2, bug #30552 (project avr-libc):

For device ATTiny43U: 
the patch given for bug30569 defines ADC and ADCW to 0x04 (using _SFR_MEM16
macro) while datasheet clearly says that address of ADCL is 0x24 and that of
ADCH is 0x25.

The  following diff uses _SFR_IO16 instead of _SFR_MEM16. _SFR_IO16 adds an
offset of 0x20. I think this is appropriate.

Index: iotn43u.h
===================================================================
--- iotn43u.h   (revision 2184)
+++ iotn43u.h   (working copy)
@@ -74,7 +74,10 @@
 #define ADLAR  4
 #define ACME   6
 
+#ifndef _ASSEMBLER_
 #define ADC _SFR_IO16(0x04)
+#endif
+#define ADCW _SFR_IO16(0x04)
 
 #define ADCL _SFR_IO8(0x04)


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