HD64F36049 datasheet(129/562 Pages) RENESAS

129 / 562 page

Section 7 ROM

Rev. 3.00 Mar. 15, 2006 Page 97 of 526

REJ09B0060-0300

Table 7.2

Boot Mode Operation

Communication Contents

Processing Contents

Host Operation

LSI Operation

Processing Contents

Continuously transmits data H'00

at specified bit rate.

Branches to boot program at reset-start.

Boot program initiation

H'00, H'00 . . . H'00

H'00

H'55

Transmits data H'55 when data H'00

is received error-free.

H'55 reception

H'XX

Transmits number of bytes (N) of

programming control program to be

transferred as 2-byte data

(low-order byte following high-order

byte)

Transmits 1-byte of programming

control program (repeated for N times)

H'AA reception

Upper bytes, lower bytes

Echoback

H'AA

Branches to programming control program

transferred to on-chip RAM and starts

execution.

Transmits data H'AA to host.

Checks flash memory data, erases all flash

memory blocks in case of written data

existing, and transmits data H'AA to host.

(If erase could not be done, transmits data

H'FF to host and aborts operation.)

H'FF

Boot program

erase error

• Measures low-level period of receive data

H'00.

• Calculates bit rate and sets BRR in SCI3.

• Transmits data H'00 to host as adjustment

end indication.

Echobacks the 2-byte data

received to host.

Echobacks received data to host and also

transfers it to RAM.

(repeated for N times)

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