SPIA_GetWordData
Yes
NoData
Received
?
Send dummy
character
Read LSB
Data
Received
?
No
Yes
Read MSB
Return MSB:LSB
Send dummy
character
SPI_Boot
Yes
No
(0x08AA)
?
Valid
KeyValue
Enable the SPI-A clock
Set the LSPCLK to 4
Enable SPISIMOA,
SPISOMI and SPICLKA
pin functionality and enable
Set up SPI-A for
8-bit character,
Use internal SPI clock,
master mode
Use slowest baud rate (0x7F)
Relinquish SPI-A from reset
(GPIO19)
Set chip enable high
Enable EEPROM
Send read command and
start at EEPROM address
0x0000
Read KeyValue
Return
FLASH_ENTRY_POINT
Read LOSPCP value
Change LOSPCP
Change SPIBRRRead SPIBRR value
Read and discard 7
reserved words
address
Read EntryPoint
Call CopyData
EntryPoint
Return
pullups on those pins
Bootloader Features
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SPRUI07–March 2020
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Boot ROM
Figure 2-31. Data Transfer From EEPROM Flow
Figure 2-32. Overview of SPIA_GetWordData Function
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