4 May
2009
4 May
'09
2:41 p.m.
Wolfgang Denk schrieb:
What is "slow clock"?
On (some) ARM SoC there are two oscillators: A "slow" free running oscillator typically with a dedicated 32 kHz crystal and the "main" oscillator with a dedicated crystal in the MHz range.
The processor starts with the slow slock enabled and init code needs to set up PLLs and muxes etc. to enable the main oscillator and switch to derived clocks like master clock, cpu clock, IO clock and so on.