SW500007 Microchip Technology, SW500007 Datasheet - Page 156

• Manufacturer Part Number: SW500007
• Description: PICC-18 PRO
• Manufacturer: Microchip Technology
• Type: Compilerr
• Series: PIC18r

Specifications of SW500007

• Supported Families: PIC18
• Core Architecture: PIC
• Software Edition: Professional
• Kit Contents: Software And Docs
• Mcu Supported Families: PIC18
• Tool Function: Compiler
• Tool Type: Compiler
• Lead Free Status / RoHS Status: Not applicable / RoHS Compliant
• For Use With/related Products: PIC18 Series
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 015P; 778-1002; 778-1002

Cref
and the sum placed in the locations where1 through where2 inclusive. For an 8 bit checksum
these two addresses should be the same. For a checksum stored low byte first, where1 should be less
than where2, and vice versa. The +offset is optional, but if supplied, the value offset will be used
to initialise the checksum. Otherwise it is initialised to zero. For example:
This will sum the bytes in 5 through 1FFFH inclusive, then add 1FFFH to the sum. The 16 bit
checksum will be placed in locations 3 and 4, low byte in 3. The checksum is initialised with 1FFFH
to provide protection against an all zero ROM, or a ROM misplaced in memory. A run time check of
this checksum would add the last address of the ROM being checksummed into the checksum. For
the ROM in question, this should be 1FFFH. The initialization value may, however, be used in any
desired fashion.
5.13 Cref
The cross reference list utility CREF is used to format raw cross-reference information produced by
the compiler or the assembler into a sorted listing. A raw cross-reference file is produced with the
--CR option to the compiler. The assembler will generate a raw cross-reference file with a -C option
(most assemblers) or by using an OPT CRE directive (6800 series assemblers) or a XREF control line
(PIC assembler). The general form of the CREF command is:
where options is zero or more options as described below and files is one or more raw cross-
reference files. CREF takes the options listed in Table 5.5.
5.13.1 -Fprefix
It is often desired to exclude from the cross-reference listing any symbols defined in a system header
file, e.g. <stdio.h>. The -F option allows specification of a path name prefix that will be used to
exclude any symbols defined in a file whose path name begins with that prefix. For example, -F\
will exclude any symbols from all files with a path name starting with \.
5.13.2 -Hheading
The -H option takes a string as an argument which will be used as a header in the listing. The default
heading is the name of the first raw cross-ref information file specified.
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Each option is described in more detail in the following paragraphs.
0005-1FFF 3-4 +1FFF
cref options files
Linker and Utilities