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3.17.16 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.
- @gcctabopt -m6811
- @gcctabopt -m68hc11
Generate output for a 68HC11. This is the default when the compiler is configured for 68HC11-based systems.
- @gcctabopt -m6812
- @gcctabopt -m68hc12
Generate output for a 68HC12. This is the default when the compiler is configured for 68HC12-based systems.
- @gcctabopt -m68S12
- @gcctabopt -m68hcs12
Generate output for a 68HCS12.
- @gcctabopt -mauto-incdec
Enable the use of 68HC12 pre and post auto-increment and auto-decrement addressing modes.
- @gcctabopt -minmax
- @gcctabopt -nominmax
Enable the use of 68HC12 min and max instructions.
- @gcctabopt -mlong-calls
- @gcctabopt -mno-long-calls
Treat all calls as being far away (near). If calls are assumed to be far away, the compiler will use the
callinstruction to call a function and the
rtcinstruction for returning.
- @gcctabopt -mshort
intto be 16 bits wide, like
- @gcctabopt -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.