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Rev. 2.0, 11/00, page 190 of 1037
Set pins to boot mode and
execute reset-start
Host transfers data (H'00)
continuously at prescribed bit rate
This LSI measures low period of
H'00 data transmitted by host
This LSI calculates bit rate and
sets value in bit rate register
After bit rate adjustment, transmits
one H'00 data byte to host to
indicate end of adjustment
Host confirms normal reception of
bit rate adjustment end indication
(H'00) and transmits one H'55
data byte
Upon receiving H'55, this LSI
transmits one H'AA data byte to
host
Host transmits number of
programming control program
bytes (N), upper byte followed by
lower byte
This LSI transmits received
number of bytes to host as verify
data (echo-back)
Host transmits programming
control program sequentially in
byte units
This LSI transmits received
programming control program to
host as verify data (echo-back)
Transfer received programming
control program to on-chip RAM
End of transmission
Check flash memory data, and if
data has already been written,
erase all blocks
After confirming that all flash
memory data has been erased,
this LSI transmits one H'AA data
byte to host
Execute programming control
program transferred to on-chip
RAM
Note :
If a memory cell does not operate normally and cannot be erased, one
H'FF byte is transmitted as an erase error, and the erase operation and
subsequent operations are halted.
Figure 8.8 Boot Mode Execution Procedure
Start
n = 1
No
n = N?
Yes
n+1
n
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