Renesas 70 Manual De Usuario

   

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MR308 comes with two types of startup programs as described below. 

• 

start.a30 

This startup program is used when you created a program using the assembly language. 

• 

crt0mr.a30 

This startup program is used when you created a program using the C language. 

This program is derived from "start.a30" by adding an initialization routine in C language. 

The startup programs perform the following: 

• 

Initialize the processor after a reset. 

• 

Initialize C language variables (crt0mr.a30 only). 

• 

Set the system timer. 

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Initialize MR308's data area. 

 

Copy these startup programs from the directory indicated by environment variable "LIB308" to the current direc-
tory.If necessary, correct or add the sections below: 

When using HEW, the user can choose to automatically generate a sample during project generation or use an 
already created one. 

• 

Setting processor mode register 

Set a processor mode matched to your system to the processor mode register. 

• 

Adding user-required initialization program 

To add an initialization program needed for the user, add it at a place immediately preceding the ini-
tialization of standard input/output functions in the C language startup program (crt0mr.a30).   

If the standard input/output functions are unused, make the relevant part a comment.