Specifications

Developer’s Serial Bootloader, Rev. 13
MCU slave software
Freescale Semiconductor44
Figure 27. MC68HC908JK/JL bootloader
RESET
SRSR RESET
SOURCE TEST
MCU CONFIG
...
WAIT FOR COMMAND
SEND IDENT DATA
RECEIVE ADDRESS RECEIVE ADDRESS
RECEIVE LENGTH
RECEIVE DATA
CALL WRITE
ROUTINE IN ROM
CALL ERASE
ROUTINE IN ROM
RECEIVE ADDRESS
RECEIVE LENGTH
SEND DATA
SEND ACK
EXECUTE ILLEGAL
OPERATION
SEND ACK AND
WAIT FOR ANSWER
YES
YES
USER CODE
START
POR CAUSED RESET
...
MEASURE BREAK
WAIT FOR HI-LO EDGE
CALIBRATE SOFT-SCI
IDENT? ERASE? WRITE? READ? QUIT?
YES YES YES
YES
NO NO NO NO
NO
1
2
1
1
2
2
2
TIMEOUT EXPIRED
NO
NOT POR
?