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STM32MP157C Datasheet(PDF) 149 Page - STMicroelectronics

Part # STM32MP157C
Description  Arm® dual Cortex®-A7 800 MHz Cortex®-M4 MPU, 3D GPU, TFT/DSI, 37 comm. interfaces, 29 timers, adv. analog, crypto
PDF  260 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32MP157C Datasheet(HTML) 149 Page - STMicroelectronics

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STM32MP157C/F
Electrical characteristics
238
6.3.8
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 I/O.
Digital and analog bypass modes are available.
The external clock signal has to respect the Table 52: I/O static characteristics. However,
the recommended clock input waveform is shown in Figure 15 for digital bypass mode and
in Figure 16 for analog bypass mode. In analog bypass mode the clock can be a sinusoidal
waveform.
Figure 15. High-speed external clock source AC timing diagram (digital bypass)
Table 29. High-speed external user clock characteristics
(digital bypass)(1)
1. Guaranteed by design.
Symbol
Parameter
Min
Typ
Max
Unit
fHSE_ext
User external clock source frequency
8
24
48
MHz
VSW (VHSEH -VHSEL) OSC_IN amplitude
0.7×VDD
-VDD
V
VDC
OSC_IN input voltage
VSS
-0.3×VSS
tW(HSE)
OSC_IN high or low time
7
-
-
ns
Table 30. High-speed external user clock characteristics
(analog bypass)(1)
Symbol
Parameter
Min
Typ
Max
Unit
fHSE_ext
User external clock source frequency
8
24
48
MHz
duty cycle (Square wave)
45
50
55
%
duty cycle deterioration
0
±10(2)
±20(3)
%
VHSE
Absolute input range
0
-
VDD
-
ai17528b
OSC_IN
External
STM32
clock source
VHSEH
tf(HSE)
tW(HSE)
IL
90 %
10 %
THSE
t
tr(HSE)
tW(HSE)
fHSE_ext
VHSEL



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