Specifications

References

www.ti.com

The VIC port is disabled upon any CPU reset and must be enabled by the application. The VIC is enabled

by setting the VE bit in the CPU’s System Control Register, as shown below.

mrc p15, #0, r0, c1, c0, #0

orr r0, r0, #0x01000000

mcr p15, #0, r0, c1, c0, #0

2.23 Enable Normal Interrupts in the Cortex-R4F CPU

The normal interrupt (IRQ) is disabled inside the Cortex-R4F CPU by default and after a CPU reset. The

normal interrupt can be enabled by clearing the "I" bit of the Current Program Status Register (CPSR)

inside the Cortex-R4F CPU. This can simply be done by executing the below instruction in a privileged

CPU mode. This can be any CPU mode other than the "user" mode.

cpsie i,f

2.24 Additional Initializations Required by Compiler

If the source program is written using C or C++, the TI compiler requires the creation of the C/C++

run-time environment. This includes:

• Initialization of copy table, if required

• Initialization of global and static variables defines in C/C++

• Initialization of global constructors

• Make a function call to branch to the main application

These requirements could be different for each compiler. The compiler reference manual must be referred

to identify the specific requirements for the compiler being used.

2.25 Call the Main Application

This is a normal function call when using C/C++. It could be a branch or branch-link to the name of the

routine that executes the application.

For example:

main();

exit();

3 References

• TMS570LSxxx7 16/32-Bit Risc Flash Microcontroller Data Sheet (SPNS162)

• TMS570LSxxx5 16/32-Bit Risc Flash Microcontroller Data Sheet (SPNS164)

• TMS570LSxxx4 16/32-Bit Risc Flash Microcontroller Data Sheet (SPNS165)

• RM48Lx50 16/32-Bit Risc Flash Microcontroller Data Sheet (SPNS174)

• RM48Lx40 16/32-Bit Risc Flash Microcontroller Data Sheet (SPNS175)

• RM48Lx30 16/32-Bit Risc Flash Microcontroller Data Sheet (SPNS176)

• TMS570LS31/21 16/32-Bit RISC Flash Microcontroller Technical Reference Manual (SPNU499)

• RM48 16/32-Bit RISC Flash Microcontroller Technical Reference Manual (SPNU503)

Initialization of Hercules™ ARM

Cortex™-R4F Microcontrollers SPNA106– September 2011

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