External Clock Source Characteristics; Table 25. Low-Power Mode Wakeup Timings; Table 26. High-Speed External User Clock Characteristics - STMicroelectronics STM32L151QCH6 Manual

STM32L151xC/C-A STM32L152xC/C-A
Symbol
t
WUSLEEP
t
WUSLEEP_LP
t
WUSTOP
t
WUSTDBY
1. Guaranteed by characterization, not tested in production, unless otherwise specified
6.3.6

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
recommended clock input waveform is shown in
Symbol
f
HSE_ext

Table 25. Low-power mode wakeup timings

Parameter
Wakeup from Sleep mode
Wakeup from Low-power sleep
mode, f = 262 kHz
HCLK
Wakeup from Stop mode,
regulator in Run mode
ULP bit = 1 and FWU bit = 1
Wakeup from Stop mode,
regulator in low-power mode
ULP bit = 1 and FWU bit = 1
Wakeup from Standby mode
ULP bit = 1 and FWU bit = 1
Wakeup from Standby mode
FWU bit = 0

Table 26. High-speed external user clock characteristics

Parameter
User external clock source
frequency
DocID026119 Rev 5
Electrical characteristics
Conditions
f = 32 MHz
HCLK
f = 262 kHz
HCLK
Flash enabled
f = 262 kHz
HCLK
Flash switched OFF
f = f = 4.2 MHz
HCLK MSI
f = f = 4.2 MHz
HCLK MSI
Voltage range 1 and 2
f = f = 4.2 MHz
HCLK MSI
Voltage range 3
f = f = 2.1 MHz
HCLK MSI
f = f = 1.05 MHz
HCLK MSI
f = f = 524 kHz
HCLK MSI
f = f = 262 kHz
HCLK MSI
f = f = 131 kHz
HCLK MSI
f = MSI = 65 kHz
HCLK
f = MSI = 2.1 MHz
HCLK
f = MSI = 2.1 MHz
HCLK
Section
Figure 14.
Conditions Min
CSS is on or
1
PLL is used
CSS is off, PLL
0
not used
(1)
Typ Max Unit
0.4 -
46 -
46 -
8.2 -
7.7 8.9
µs
8.2 13.1
10.2 13.4
16 20
31 37
57 66
112 123
221 236
58 104
2.6 3.25 ms
6.3.12. However, the
(1)
Typ Max Unit
8 32 MHz
8 32 MHz
75/133
113