SH7052 datasheet(781/919 Pages) RENESAS

781 / 919 page

755

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

SH7054F measures low period

of H'00 data transmitted by host

SH7054F calculates bit rate and

sets value in bit rate register

After bit rate adjustment, SH7054F

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,

SH7054F transmits one H'AA

data byte to host

Host transmits number

of programming control program

bytes (N), upper byte followed

by lower byte

SH7054F transmits received

number of bytes to host as verify

data (echo-back)

n = 1

Host transmits programming control

program sequentially in byte units

SH7054F 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,

SH7054F transmits one H'AA data

byte to host

Execute programming control

program transferred to on-chip RAM

n + 1

→ n

Figure 21.9 Boot Mode Execution Procedure

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