![]() ![]() ![]() ![]() My recommendation: Stick to 42 MHz max with zero latency while developing your application. FPU operations) and program jumps (due to functions and interrupts), calculating the "real" operating frequency gets really hard. However, when you take in consideration that instructions can take more than one cycle (e.g. ![]() NOTE: 84 MHz and latency one SHOULD be equivalent to 42 MHz, since the uC will execute one instruction and wait one cycle before executing the next instruction. Some WTFs when using interrupts and enabling optimization. From my observations the following latencies work well: NOTE: As far as I know, the STM32F4 devices from the revision "A" can't use the ART accelerator (see the errata sheet here), for these devices the LATENCY parameter is important when configuring the clock. ![]()
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