3.17.2 M68hc1x Options

These are the `-m' options defined for the 68hc11 and 68hc12 microcontrollers. The default values for these options depends on which style of microcontroller was selected when the compiler was configured; the defaults for the most common choices are given below.

-m6811

-m68hc11

Generate output for a 68HC11. This is the default when the compiler is configured for 68HC11-based systems.

-m6812

-m68hc12

Generate output for a 68HC12. This is the default when the compiler is configured for 68HC12-based systems.

-m68S12

-m68hcs12

Generate output for a 68HCS12.

-mauto-incdec

Enable the use of 68HC12 pre and post auto-increment and auto-decrement addressing modes.

-minmax

-nominmax

Enable the use of 68HC12 min and max instructions.

-mlong-calls

-mno-long-calls

Treat all calls as being far away (near). If calls are assumed to be far away, the compiler will use the call instruction to call a function and the rtc instruction for returning.

-mshort

Consider type int to be 16 bits wide, like short int.

-msoft-reg-count=count

Specify the number of pseudo-soft registers which are used for the code generation. The maximum number is 32. Using more pseudo-soft register may or may not result in better code depending on the program. The default is 4 for 68HC11 and 2 for 68HC12.