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Enter bootloader
Init hardware
Load user-config
data
Configure clocks
Property and
Memory interfaces
Is
BootPin
asserted to
boot from
ROM?
Is user
application
valid?
Disable Timeout
detection
Enable Timeout
Check and enable
Timeout value
Shutdown all
Peripherals
Is
Timeout Check
enabled and
has Timeout
occurred?
Ping packet
received on
LPUART0,1,2 ?
Shutdown unused
Peripherals
Jump to user
application
Enter bootloader
state machine
No
Yes
No
No
No
Yes
No
Yes
Yes
Yes
Was a
activity
detected on
USB?
No
Was
Yes
No
Is
direct boot
valid?
No
Yes
Init flash
USB
LPI2C0,1,2
LPSPI0,1,2
LPUART0,1,2
Initialize
Initialize
USB
LPI2Cn
LPSPIn
LPUARTn
Use the enablePeripheral field
(in user config data)
to enable (or not)
on
LPSPI0,1,2 ?
Was
0x5A received
on
LPI2C0,1,2 ?
Was
0x5A received
Figure 14-2. Kinetis Bootloader Start-up Flowchart
Chapter 14 Kinetis ROM Bootloader
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors
255
Summary of Contents for K32 L2A Series
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Page 122: ...Flash Memory Clock K32 L2A Reference Manual Rev 2 01 2020 122 NXP Semiconductors...
Page 158: ...Debug and security K32 L2A Reference Manual Rev 2 01 2020 158 NXP Semiconductors...
Page 174: ...Module Signal Description Tables K32 L2A Reference Manual Rev 2 01 2020 174 NXP Semiconductors...
Page 246: ...Application information K32 L2A Reference Manual Rev 2 01 2020 246 NXP Semiconductors...
Page 374: ...CMP Trigger Mode K32 L2A Reference Manual Rev 2 01 2020 374 NXP Semiconductors...
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