
The maximum supported I2C baud rate depends on corresponding clock configuration
field in the BCA. Typical supported baud rate is 400 kbps with factory settings. Actual
supported baud rate may be lower or higher than 400 kbps, depending on the actual value
of the clockFlags and the clockDivider fields.
Because the I2C peripheral serves as an I2C slave device, each transfer should be started
by the host, and each outgoing packet should be fetched by the host.
• An incoming packet is sent by the host with a selected I2C slave address and the
direction bit is set as write.
• An outgoing packet is read by the host with a selected I2C slave address and the
direction bit is set as read.
• 0x00 will be sent as the response to host if the target is busy with processing or
preparing data.
The following flow charts demonstrate the communication flow of how the host reads
ping packet, ACK and response from the target.
Fetch
Ping response
Yes
Yes
End
Report Error
No
No
Read 1 byte
from target
0x5A
received?
packet
Read leftover bytes
of ping response
0x7A
received?
Read 1 byte
from target
Figure 23-16. Host reads ping response from target via I2C
Chapter 23 Kinetis ROM Bootloader
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
617
Summary of Contents for KE1xF Series
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