This anomaly applies to IC Rev. Engineering D, build codes CLAA-DA0, QKAA-DB0.
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The CPU skips the first instruction after instruction cache is disabled.
The code executes instructions to disable the instruction cache.
The program does not execute as expected.
_attribute_((aligned(ICACHE_LINE_SIZE)))
void icache_disable(void) {
int key = DisableInterrupts();
__ISB();
NRF_NVMC->ICACHECNF = 0;
__ISB();
EnableInterrupts(key);
}