Motorola MCU MC9S12DP256 Manuale Utente Scaricare il pdf (Pagina 4)

While you don’t need to memorize all of the instructions, you should know how to use

the manual to find any necessary information. For a handful of instructions however it

will be useful to know the following without referencing the manual:

• What the instruction does

• How to use it

• How many and what kind of parameters is takes (there are usually many cases

possible)

• How many CPU cycles it takes to execute (there are usually many cases

depending on the parameter)

Once you have written a piece of assembly code, you will need to compile it and load it

onto the microcontroller. To do so, we will be using a debugging tool called NoICE. To

get started with the NoICE debugger, please refer to NoICE_intro.doc which posted on

the course website.

Some Other Useful Information

• The ORG assembler directive indicates to the compiler where in the

microcontroller’s memory the assembly program should be stored.

• The RTS command is used to return from the current subroutine. If a subroutine

has not been called, RTS will end the program.

• The following is the memory map of the MC9S12DP256:

1 2 3 4 5 6

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Motorola MCU MC9S12DP256 Manuale Utente Pagina 4