H8SSLASH2214 datasheet(626/936 Pages) RENESAS

626 / 936 page

Section 15 ROM

Rev.4.00 Sep. 18, 2008 Page 566 of 872

REJ09B0189-0400

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.

Start

Set pins to boot mode

and execute reset-start

Host transfers data (H'00)

continuously at prescribed bit rate

HD64F2214 measures low period

of H'00 data transmitted by host

HD64F2214 calculates bit rate and

sets value in bit rate register

After bit rate adjustment,

HD64F2214 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,

HD64F2214 transmits one H'AA

data byte to host

Host transmits number

of programming control program

bytes (N), upper byte followed

by lower byte

HD64F2214 transmits received

number of bytes to host as verify

data (echo-back)

n = 1

Host transmits programming control

program sequentially in byte units

HD64F2214 transmits received

programming control program to

host as verify data (echo-back)

Transfer received programming

control program to on-chip RAM

n = N?

Yes

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,

HD64F2214 transmits one H'AA

data byte to host

Execute programming control

program transferred to on-chip RAM

n + 1

→ n

Figure 15.10 Boot Mode Execution Procedure

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