6.2
Clocks
Two clocks are available on STM32MP157F-EV1 for the STM32MP157FAA1 target microprocessor.
6.2.1
LSE clock
•
External 32.768 kHz crystal
6.2.2
HSE clock
•
External 24 MHz crystal
6.3
Reset sources
The reset signal of the STM32MP157F-EV1 platform is active low.
The sources of the platform reset are:
•
Two reset buttons MB1263/B1 and MB1262/B2 (black buttons)
•
STM32MP157FAA1 microprocessor: internal voltage monitor, SW request or watchdog
•
STPMIC1
•
JTAG/SWD connector MB1262/CN14
•
ETM Trace Mictor-38 connector MB1262/U10
•
Embedded ST-LINK/V2-1
The STM32MP157FAA1 microprocessor also drives a subsystem reset, SUB_NRST signal on PD10 IO, to the
peripherals: USB Host Hub, MFX, Ethernet, and RGB_LTDC connector.
6.4
User buttons and LEDs
describes the HW configuration for the user buttons and LEDs.
Table 8.
HW configuration for the user buttons and LEDs
I/O
LED color and label
Button label
PD8
PD8 is connected to the orange LD4. Active High
-
PD9
PD9 is connected to the blue LD5. Active High
-
PA13
PA13 is connected to red LD2. Active Low
User PA13
PA14
MFX_IO13 is connected to orange LED LD7. Active Low
User PA14
6.5
Physical input devices: buttons
The STM32MP157F-EV1 board provides a number of input devices for physical human control:
•
Two reset buttons (MB1263/B1 and MB1262/B2)
•
Four-way joystick controller with select key (MB1262/B1)
•
Wake-up button (MB1263/B4)
Table 9.
Physical user devices: buttons
Devices
Purpose - I/O
Wake-up button (MB1263/B4)
Awakes the platform from low-power modes.
Connected to STPMIC1 PONKEY, which
generates a wake-up signal on STM32MP157
PA0
Reset buttons (MB1263/B1 or MB1262/B2)
NRST signal
JOY_CENTER: Joystick select key (MB1262/B1 pin2)
MFX_IO0
JOY_DOWN: Joystick down direction (MB1262/B1 pin3)
MFX_IO1
UM2648
Clocks
UM2648
-
Rev 1
page 13/61
