Fix error with ADD instruction and AC bit

The overflow bit was written instead of the auxiliary carry bit.

diff --git a/src/opcode2c.pl b/src/opcode2c.pl
index 67c667f..dcb6894 100755 (executable)
--- a/src/opcode2c.pl
+++ b/src/opcode2c.pl
@@ -468,7 +468,7 @@ for ($i=0 ; $i< 256; $i++) {
            print INST_IMP "   cpu8051_WriteD( _PSW_, ( cpu8051_ReadD( _PSW_ ) | 0x80 ) );\n";
            print INST_IMP "   if ( ( destination & 0x7F ) + ( source & 0x7F ) < 0x80 )  cpu8051_WriteD( _PSW_, ( cpu8051_ReadD( _PSW_ ) | 0x04 ) );\n";
            print INST_IMP "} else if ( ( destination & 0x7F ) + ( source & 0x7F ) > 0x7F )  cpu8051_WriteD( _PSW_, ( cpu8051_ReadD( _PSW_ ) | 0x04 ) );\n";
-           print INST_IMP "if ( ( destination & 0x0F ) + ( source & 0x0F ) > 0x0F )   cpu8051_WriteD( _PSW_, ( cpu8051_ReadD( _PSW_ ) | 0x04 ) );\n";
+           print INST_IMP "if ( ( destination & 0x0F ) + ( source & 0x0F ) > 0x0F )   cpu8051_WriteD( _PSW_, ( cpu8051_ReadD( _PSW_ ) | 0x40 ) );\n";
            print INST_IMP "destination += source;\n";
        }