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• The program once field only supports programming once, so any attempted to
reprogram a program once field will get an error response.
• Writing to the program once field requires the byte count to be 4-byte aligned or 8-
byte aligned.
The FlashProgramOnce command uses 3 parameters: index, byteCount, data.
Table 14-35. Parameters for FlashProgramOnce Command
Byte #
Command
0 - 3
Index of program once field
4 - 7
Byte count (must be evenly divisible by 4)
8 - 11
Data
12 - 16
Data
Host
Target
Process
Command
ACK: 0x5A A1
ACK: 0x5A A1
Generic Response
FlashProgramOnce: index=0, byteCount=4, data=0x12345678
0x5A A4 10 00 7E 89 0E 00 00 03 00 00 00 00 04 00 00 00 78 56 34 12
0x5A A4 0C 00 88 1A A0 00 00 02 00 00 00 00 0E 00 00 00
Figure 14-14. Protocol Sequence for FlashProgramOnce Command
Table 14-36. FlashProgramOnce Command Packet Format (Example)
FlashProgramOnce
Parameter
Value
Framing packet
start byte
0x5A
packetType
0xA4, kFramingPacketType_Command
length
0x10 0x00
crc16
0x7E4 0x89
Command packet
commandTag
0x0E – FlashProgramOnce
flags
0
reserved
0
parameterCount
3
index
0x0000_0000
Table continues on the next page...
Chapter 14 Kinetis ROM Bootloader
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors
281
Содержание K32 L2A Series
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