Hi;

I'm just getting started with assembly programming for the SAM7S256. I'm wondering how I write a value to a specific "built in" register? For example, let's say I want to reset the processor. I know that I need to put together a 32 bit value with the reset key and the PROCRST flag (0xA5000001), but how to I load this value into the RSTC_CR register? I.e., what is the syntax to address that built in register?

FYI, I'm using IAR EWARM. Do I need to use the ioat91sam7s256.h file they provide?

Thanks!

Hi,

Some programmers like to use the supplied header files as they save doing them all yourself but they do tend to have more than you need but you can always cut them down if you really want to.

// constant equate
rsmc = 0xFFFFFD00 ; rst manager control

// little bit of code, bit3 also set here to
// produce an external reset
ldr r4, =rsmc ; reset manage
ldr r3, =0xA5000001 ; enable reset bit
str r3, [r4, #0x08] ;

Ah, it was the [r4, #0x08] part that I was missing.

Thank you kindly!

Derrick