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Enter Bootloader
Init hardware
Init flash driver
Load user-config
data
Configure clocks;
Init microseconds
driver,memory &
property interface
Init
LPUARTn, LPSPIn,
LPI2Cn
Is BootPin
asserted?
Is user
application
valid?
No
Disable Timeout
detection
No
Yes
Enable Timeout
check and enable
Timeout value
Was a Ping packet
received on LPUARTn?
Was a Ping packet
received on LPI2Cn?
Was a Ping packet
received on LPSPIn?
Is Timeout check
enabled and has
Timeout occurred?
Shutdown
all peripherals
Jump to
user application
Shutdown
unused peipherals
Enter Bootloader
state machine
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Use the enabledPeripherals field
in user config data to enable (or not)
LPUARTn (or LPSPIn or LPI2Cn)
Figure 22-2. Kinetis Bootloader Start-up Flowchart
22.3.4 Clock Configuration
By default, the bootloader does not modify clocks. The Kinetis Bootloader in ROM will
use the clock configuration of the chip out of reset unless the clock configuration bits in
the FOPT register are cleared.
• Alternate clock configurations are supported, by setting fields in the Bootloader
Configuration Area (BCA) shown in
• If the HighSpeed flag of the clockFlags configuration value is cleared, the bootloader
will enable the internal 48 MHz reference clock.
Functional Description
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
476
NXP Semiconductors
Summary of Contents for Kinetis KE1xZ256
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