H8SLASH3028F datasheet(623/923 Pages) RENESAS

623 / 923 page

Rev. 2.00, 09/03, page 593 of 890

n = N?

Yes

Set pins to boot program mode and execute reset-start

n = 1

n + 1

→ n

Host transfers data (H'00) continuously at prescribed

bit rate

H8/3028F-ZTAT measures low period of H'00 data

transmitted by host

After bit rate adjustment, H8/3028F-ZTAT 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, H8/3028F-ZTAT transmits one

H'AA byte to host

Host transmits number of programming control program

bytes (N), upper byte followed by lower byte

H8/3028F-ZTAT transmits received number of bytes to

host as verify data (echo-back)

Host transmits programming control program

sequentially in byte units

H8/3028F-ZTAT 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, H8/3028F-ZTAT transmits one H'AA byte to

host

Execute programming control program transferred to

on-chip RAM

Start

H8/3028F-ZTAT calculates bit rate and sets value in bit

rate register

Note: If a memory cell does not operate normally and cannot be erased, one H'FF byte is transmitted as an erase error

indication, and the erase operation and subsequent operations are halted.

Figure 18.6 Boot Mode Execution Procedure

H8/3028F Datasheet(PDF) 623 Page - Renesas Technology Corp