HD6432142 datasheet(701/1177 Pages) RENESAS

701 / 1177 page

Section 22 ROM (Mask ROM Version, H8S/2148 F-ZTAT, H8S/2147N F-ZTAT, H8S/2144 F-ZTAT, and H8S/2142 F-ZTAT)

Rev. 4.00 Sep 27, 2006 page 657 of 1130

REJ09B0327-0400

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 program mode

and execute reset-start

Host transfers data (H'00)

continuously at prescribed bit rate

MCU measures low period

of H'00 data transmitted by host

MCU calculates bit rate and

sets value in bit rate register

After bit rate adjustment, 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,

MCU transfers part of boot

program to RAM

Host transmits number

of user program bytes (N),

upper byte followed by lower byte

MCU transmits received

number of bytes to host as verify

data (echo-back)

n = 1

Host transmits user program

sequentially in byte units

MCU transmits received user

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,

MCU transmits one H'AA data

byte to host

Transmit one H'AA data byte to host,

and execute programming control

program transferred to on-chip RAM

n + 1

→ n

Figure 22.8 Boot Mode Execution Procedure

HD6432142 Datasheet(PDF) 701 Page - Renesas Technology Corp

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