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I can't write to 0x4004xxxx

temistocles chalaça

Hi! I'm new on ARM.
I'm using uVision 4.71 with j-link + LPC1343 cortex-m3 running following code:

movw r0,#0x0001 ;working

ldr r1,=0x4004400c ;working

str r0, [r1, #0] ;not working

movw r0,#0x00ff ;working

ldr r1,=0x50008000 ;working

str r0, [r1] ;working

movw r0,#0x00aa ;working

ldr r1,=0x50003FFC ;working

str r0, [r1] ;working

movw r0,#0x000f ;working

ldr r1,=0x50038000 ;working

str r0, [r1] ;working

movw r0,#0x0002 ;working

ldr r1,=0x40044084 ;working

str r0, [r1] ;not working

movw r0,#0x0000 ;working

ldr r1,=0x50033ffc ;working

str r0, [r1] ;working

seems that addresses = 0x4004xxxx have no permission to writes
Can anybody help me?

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