h8s-2169 Renesas Electronics Corporation., h8s-2169 Datasheet - Page 733

• Manufacturer Part Number: h8s-2169
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

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 22.8 Boot Mode Execution Procedure
Set pins to boot mode and execute reset-start
Host transfers data (H'00) continuously at prescribed
bit rate
The chip measures low period of H'00 data transmitted
by host
The chip 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
After receiving H'55, trransmit one H'AA data byte
to host
Host transmits number of user program bytes (N),
upper byte followed by lower byte
The chip transmits received number of bytes to host as
verify data (echo-back)
Host transmits programming control program
sequentially in byte units
The chip transmits received programming control
program to host as verify data (echo-back)
Transfer received programming control program
Check flash memory data, and if data has already
been written, erase all blocks
Check ID code at beginning of user program transfer
area
Execute programming control program transferred
to on-chip RAM
to on-chip RAM
Confirm that all flash memory data has been erased
Transmit one H'AA byte to host
End of transmission
ID code match?
n = N?
Start
n = 1
Yes
Yes
Rev. 3.00 Jan 18, 2006 page 705 of 1044
No
No
Transfer 1-byte of H'FF
data as an ID code
error indicator and halt
other operations
n + 1
n
REJ09B0280-0300
Section 22 ROM