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-rw-r--r--src/stm32/stm32f0.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/stm32/stm32f0.c b/src/stm32/stm32f0.c
index d7af831e..b0691c64 100644
--- a/src/stm32/stm32f0.c
+++ b/src/stm32/stm32f0.c
@@ -52,6 +52,8 @@ gpio_clock_enable(GPIO_TypeDef *regs)
RCC->AHBENR;
}
+// PLL (f0) input: 1 to 24Mhz, output: 16 to 48Mhz
+
#if !CONFIG_STM32_CLOCK_REF_INTERNAL
DECL_CONSTANT_STR("RESERVE_PINS_crystal", "PF0,PF1");
#endif