H8SLASH3021 datasheet(490/712 Pages) RENESAS

490 / 712 page

15. ROM

Rev.2.00 Mar. 22, 2007 Page 466 of 684

REJ09B0352-0200

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

H8/3022F measures low period of H'00 data transmitted

by host

After bit rate adjustment, H8/3022F 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, H8/3022F transmits one H'AA data

byte to host

Host transmits number of programming control program

bytes (N), upper byte followed by lower byte

H8/3022F transmits received number of bytes to host

as verify data (echo-back)

Host transmits programming control program

sequentially in byte units

H8/3022F 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, H8/3022F transmits one H'AA data byte to host

Execute programming control program transferred

to on-chip RAM

Start

H8/3022F calculates bit rate and sets value in bit rate

Note: If a memory cell malfunctions and cannot be erased, the H8/3022F sends one H'FF byte as an erase error, and stops

the erase operation and subsequent operations.

Figure 15.7 Boot Mode Execution Procedure

H8/3021 Datasheet(PDF) 490 Page - Renesas Technology Corp