• Supports I2C, SPI, and UART peripheral interfaces
• Automatic detection of the active peripheral
• Ability to disable any peripheral
• UART peripheral implements autobaud
• Common packet-based protocol for all peripherals
• Packet error detection and retransmission
• Flash-resident configuration options
• Fully supports internal flash security, including ability to mass erase or unlock
security via the backdoor key
• Protection of RAM used by the bootloader while it is running
• Provides command to read properties of the device, such as flash and RAM size
• Multiple options for executing the bootloader either at system start-up or under
application control at runtime
• Supports internal flash
• Supports encrypted image download
Table 22-1. Commands supported by the Kinetis Bootloader in ROM
Command
Description
When flash security is
enabled, then this command is
Execute
Run user application code that never returns control to
the bootloader
Not supported
FlashEraseAll
Erase the entire flash array
Not supported
FlashEraseRegion
Erase a range of sectors in flash
Not supported
WriteMemory
Write data to memory
Not supported
FlashSecurityDisable
Attempt to unlock flash security using the backdoor
key
Supported
GetProperty
Get the current value of a property
Supported
Reset
Reset the chip
Supported
SetProperty
Attempt to modify a writable property
Supported
FlashEraseAllUnsecure
Erase the entire flash array, including protected
sectors
Supported
22.3 Functional Description
The following sub-sections describe the Kinetis Bootloader in ROM functionality.
22.3.1 Memory Maps
While executing, the Kinetis Bootloader uses ROM and RAM memory.
Chapter 22 Kinetis ROM Bootloader
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
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