Renesas Hitachi H8S/2191, Hardware Manual

Page: 167 / 1065

Rev. 2.0, 11/00, page 140 of 1037
Start
Set pins to boot mode and
execute reset-start
Host transfers data (H'00)
continuously at prescribed bit rate
Host transmits programming
control program sequentially in
byte units
Transfer received programming
control program to on-chip RAM
This LSI calculates bit rate and
sets value in bit rate register
Host transmits number of
programming control program
bytes (N), upper byte followed by
lower byte
This LSI transmits received
programming control program to
host as verify data (echo-back)
n = 1
End of transmission
n = N?
n+1 n
Note :
Yes
No
This LSI measures low period of
H'00 data transmitted by host
After bit rate adjustment, transmits
one H'00 data byte to host to
indicate end of adjustment
Upon receiving H'55, this LSI
transmits one H'AA data byte to
host
Host confirms normal reception of
bit rate adjustment end indication
(H'00) and transmits one H'55
data byte
Execute programming control
program transferred to on-chip
RAM
This LSI transmits received
number of bytes to host as verify
data (echo-back)
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.
After confirming that all flash
memory data has been erased,
this LSI transmits one H'AA data
byte to host
Check flash memory data, and if
data has already been written,
erase all blocks
Figure 7.8 Boot Mode Execution Procedure