Datasheet

Electrical characteristics STM32F030x4/x6/x8/xC
52/93 DS9773 Rev 4
6.3.7 External clock source characteristics
High-speed external user clock generated from an external source
In bypass mode the HSE oscillator is switched off and the input pin is a standard GPIO.
The external clock signal has to respect the I/O characteristics in Section 6.3.14. However,
the recommended clock input waveform is shown in Figure 15: High-speed external clock
source AC timing diagram.
Figure 15. High-speed external clock source AC timing diagram
Table 30. Low-power mode wakeup timings
Symbol Parameter Conditions
Typ @VDD =
VDDA
Max Unit
= 3.3 V
t
WUSTOP
Wakeup from Stop mode Regulator in run mode 2.8 5
µs
t
WUSTANDBY
Wakeup from Standby mode - 51 -
t
WUSLEEP
Wakeup from Sleep mode -
4 SYSCLK
cycles
-
Table 31. High-speed external user clock characteristics
Symbol Parameter
(1)
1. Guaranteed by design, not tested in production.
Min Typ Max Unit
f
HSE_ext
User external clock source frequency 1 8 32 MHz
V
HSEH
OSC_IN input pin high level voltage 0.7 V
DDIOx
-V
DDIOx
V
V
HSEL
OSC_IN input pin low level voltage V
SS
- 0.3 V
DDIOx
t
w(HSEH)
t
w(HSEL)
OSC_IN high or low time 15 - -
ns
t
r(HSE)
t
f(HSE)
OSC_IN rise or fall time - - 20
MS19214V2
V
HSEH
t
f(HSE)
90%
10%
T
HSE
t
t
r(HSE)
V
HSEL
t
w(HSEH)
t
w(HSEL)