H8SSLASH2218 datasheet(622/750 Pages) RENESAS

622 / 750 page

Section 17 Flash Memory (F-ZTAT Version)

Rev.6.00 Jun. 03, 2008 Page 574 of 698

REJ09B0074-0600

Table 17.7

USB Boot Mode Operation

Item

Host Operation

Operation of this LSI

Branches to boot program

after reset start

Start of USB boot mode

Transmits one H'55 byte on

completion of USB enumeration

Transmits one H'AA byte to

host on reception of H'55

Transfer clock information

Transmits frequency (2 bytes),

number of multiplication

Classification (1 byte), multiplication

ratio (1 byte)

With 16 MHz system clock, H'0640,

H'01, H'01 are transmitted

With 24 MHz system clock, H'0960,

H'01, H'01 are transmitted

If received data are within

respective ranges, transmits

H'AA to host

If any received data is out-of-

ranges, transmits H'FF to host

and halts operation

Transfer number of bytes

(N) of programming control

program

Performs 2-byte transfer number of

bytes (N) of programming control

program

If received number of bytes is

within ranges, transmits H'AA

to host

If received number of bytes is

out-of- ranges, transmits H'FF

to host and halts operation

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