print INST_IMP "#include \"cpu8051.h\"\n";
print INST_IMP "#include \"memory.h\"\n";
print INST_IMP "#include \"psw.h\"\n";
+print INST_IMP "#include \"operations.h\"\n";
print INST_IMP "#include \"instructions_8051.h\"\n\n\n";
# Header for disasm.h
# ADD
if ($insttype[$i] == 13) {
- cfw("psw_clr_cy();");
- cfw("psw_clr_ac();");
- cfw("psw_clr_ov();");
- # The Overflow (OV) bit is set if there is a carry-out of bit 6 or
- # out of bit 7, but not both. In other words, if the addition of the
- # Accumulator, operand and (in the case of ADDC) the Carry flag
- # treated as signed values results in a value that is out of the
- # range of a signed byte (-128 through +127) the Overflow flag is
- # set. Otherwise, the Overflow flag is cleared.
- cfw("if ( destination + source > 0xFF ) {");
- # Carry from bit 7
- cfw(" psw_set_cy();");
- # If no carry from bit 6, set OV
- cfw(" if (((destination & 0x7F) + (source & 0x7F)) < 0x80)");
- cfw(" psw_set_ov();");
- # If no carry from bit 7, but caary from bit 6, set OV
- cfw("} else if (((destination & 0x7F) + (source & 0x7F)) > 0x7F ) psw_set_ov();");
- cfw("if (((destination & 0x0F) + (source & 0x0F)) > 0x0F) psw_set_ac();");
- cfw("destination += source;");
+ cfw("destination = addition(destination, source, 0);");
}
# JNB
}
# ADDC
+ # ADD and ADDC function identically except that ADDC adds the value of
+ # operand as well as the value of the Carry flag whereas ADD does not
+ # add the Carry flag to the result.
if ($insttype[$i] == 17) {
cfw("unsigned char carryflag = psw_read_cy();");
- cfw("psw_clr_cy();");
- cfw("psw_clr_ac();");
- cfw("psw_clr_ov();");
- cfw("if ( destination + source + carryflag > 0xFF ) {");
- cfw(" psw_set_cy();");
- cfw(" if (((destination & 0x7F) + (source & 0x7F) + carryflag) < 0x80)");
- cfw(" psw_set_ov();");
- cfw("} else if (((destination & 0x7F) + (source & 0x7F) + carryflag) > 0x7F) psw_set_ov();");
- cfw("if (((destination & 0x0F) + (source & 0x0F) + carryflag) > 0x0F) psw_set_ac();");
- cfw("destination += source + carryflag;");
+ cfw("destination = addition(destination, source, carryflag);");
}
# JC