How do I lower clock speed for MKR1000? According to data sheets, the MKR1000 runs a SAMD21 Cortex-M0+ processor at 48 MHz. For a project I need to drop that down to 16MHz to get some accurate timing in us. How can I do this? Most of the suggestions on the internet involve the ATmega* boards.

Thanks in advance.
48 MHz is a multiple of 16MHz. Why not just adjust the timing code to account?