_ _MAXROM - Define Maximum ROM Location

_ _MAXROM - Define Maximum ROM Location

Note: maxrom is preceded by two underline characters, with no space in between these characters. A space is added here for readibility only.

Syntax

_ _maxrom <expr>

Description

The _ _maxrom and _ _badrom directives together flag accesses to unimplemented registers. _ _maxrom defines the absolute maximum valid ROM address and initializes the map of valid ROM addresses to all addresses valid at and below <expr>. <expr> must be greater than or equal to the maximum ROM address of the target device. This directive is designed for use with the _ _badrom directive. Once the
_ _maxrom directive is used, strict ROM address checking is enabled, using the ROM map specified by _ _badrom.

_ _maxrom can be used more than once in a source file. Each use redefines the maximum valid ROM address and resets the ROM map to all locations.

Example

list p=12c508

__maxrom 0x1FF

__badrom 0x2 - 0x4, 0xA

org 0x5

goto 0x2 ; generates a warning

call 0x3 ; generates a warning

org 0xA

movlw 5 ; generates a warning

See Also

_ _BADROM