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instruction timing

Question asked by smead.david on Dec 27, 2011
Latest reply on Dec 29, 2011 by Clive One
I'm debugging on an Olimex STM32-P103.  I think I have the PLL set up at 8 times the 8Mhz crystal. If so, then instruction timing is pretty poor.  Here's my loop:

ldr     r0, =portc
ldr     r0, [r0]
mov     r1, #0x80
mov     r2, #0
str     r1, [r0]
str     r2, [r0]
b       loop_io

portc:  .word   0x4001100c