SH7041A datasheet(738/923 Pages) RENESAS

738 / 923 page

700

n=1

n=N?

n+1

→n

Yes

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 pin to the boot program mode

then reset start

The host continuously sends data

(H'00) using a fixed bit rate

This LSI measures the low period

of data H'00 sent by the host

This LSI calculates the bit rate and

sets value to the bit rate register

After adjustment of the bit rate, this

LSI sends 1 byte of data H'00 to the

host as a sign of completion of adjustment

The host checks whether the sign

(H'00) indicating completion of bit

rate adjustment is received, then

transmits 1 byte of data H'55

After receiving H'55, this LSI sends

1 byte of H'AA

The host sends the byte number

(N) of the user program in sequence

of upper byte then lower byte

This LSI sends the received byte

number to the host as verify data

(echo back)

The host transmits the user program

in sequence using byte units

This LSI sends the received

program to the host as verify data

(echo back)

The received user program is

transferred to the on-chip RAM

Transmission complete

Data of the flash memory is

checked. All data are erased if

data already exists

After confirming that all data of the

flash memory have been erased,

this LSI sends 1 byte of H'AA to the host

The write control program transferred

to the on-chip RAM is executed

Figure 22.9 Boot Mode Execution Procedure

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