H8SXSLASH1663 datasheet(962/1158 Pages) RENESAS

962 / 1158 page

Section 21 Flash Memory (0.18-

µm F-ZTAT Version)

Rev.1.00 Jun. 07, 2006 Page 910 of 1102

REJ09B0294-0100

1. After a transition to the USB boot mode is made, the boot program embedded in this LSI is

initialized. This LSI performs enumeration to the host after the USB boot program is

initialized.

2. Inquiry information about the size, configuration, start address, and support status of the user

MAT is transmitted to the host.

3. After inquiries have finished, all user MAT are automatically erased.

4. After all user MAT are automatically erased, the state of waiting for programming/erasing

command is entered. When the programming command is received, the state shifts to the state

of waiting for programming data. The same applies to erasing. In addition to the commands for

programming/erasing, there are commands for performing sum check, blank check (erasure

check), and memory read of the user MAT, and acquiring the current status information.

(3) Notes on USB Boot Mode Execution

• The clock of 48 MHz needs to be supplied to the USB module. Set the external clock

frequency and clock pulse generator so as to supply 48 MHz as the clock for the USB (cku).

For details, refer to section 22, Clock Pulse Generator.

• Use the PM4 pin for the D+ pull-up control connection.

• For the stable supply of the power during the flash memory programming and erasing, the

cable should not be connected via the bus powered HUB.

• If the bus powered HUB is disconnected during the flash memory programming and erasing,

permanent damage to the LSI may result.

• If the USB bus in the bus power mode enters the suspend mode, this does not make the

transition to the software standby mode in the power-down state.

H8SX/1663 데이터시트(PDF) 962 Page - Renesas Technology Corp