r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 1143

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

1. After a transition to the USB boot mode is made, the boot program embedded in this LSI is
2. Inquiry information about the size, configuration, start address, and support status of the user
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
initialized. This LSI performs enumeration to the host after the USB boot program is
initialized.
MAT is transmitted to the host.
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.
(Programming
2.
4.
completion)
Wait for program data
programming/erasing
(reset by boot mode)
Boot mode initiation
setting command
Wait for inquiry
Wait for inquiry
command
3.
Figure 22.4 USB Boot Mode State Transition Diagram
(Program selection
command reception)
All user MAT erasure
(Program data transmission)
Read/check command reception
Inquiry command reception
Inquiry command response
Command response
Rev. 1.00 Sep. 19, 2008 Page 1113 of 1342
Wait for erasure block data
Processing of inquiry
read/check command
setting command
Processing of
Enumeration
Section 22 Flash Memory
REJ09B0467-0100
1.