Fetch ACK
No
Yes
End
No
Process NAK
Yes
Report an error
No
Yes
No
Reached
maximum
retries?
Report a timeout
error
Yes
0x5A
received?
0xA2
received?
0xA1
received?
Read 1 byte
from target
Read 1 byte
from target
Figure 22-15. Host reads ACK packet from target via I2C
Fetch
Response
Yes
Yes
payload length
part from target
(2 bytes)
CRC checksum
from target
Payload length
less than supported
length?
Yes
payload data
from target
No
Set payload length
to maximum
supported length
No
No
Reached
maximum
Report a timeout
Yes
End
No
(2 bytes)
Read 1 byte
from target
0x5A
received?
0xA4
received?
Read 1 byte
from target
retries?
error (End)
Read
Read
Read
Figure 22-16. Host reads response from target via I2C
22.5.2 SPI Peripheral
The Kinetis Bootloader in ROM supports loading data into flash via the SPI peripheral,
where the SPI peripheral serves as a SPI slave.
Peripherals Supported
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
520
NXP Semiconductors
Summary of Contents for Kinetis KE1xZ256
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Page 178: ...Usage Guide Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 178 NXP Semiconductors...
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Page 410: ...Interrupts Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 410 NXP Semiconductors...
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