Datasheet

Section 25 Flash Memory
Rev. 2.00 Aug. 20, 2008 Page 950 of 1198
REJ09B0403-0200
25.4.2 USB Boot Mode
The H8S/2472 Group supports the USB boot mode. USB boot mode executes
programming/erasing of the user MAT by means of the control command and program data
transmitted from the externally connected host via the USB.
In USB boot mode, the tool for transmitting the control command and program data, and the
program data must be prepared in the host. The system configuration in USB boot mode is shown
in figure 25.9. Interrupts are ignored in USB boot mode. Configure the user system so that
interrupts do not occur.
Host or
self-power HUB
Programming tool
and program data
Software for
analyzing
control
commands
(on-chip)
This LSI
Flash
memory
On-chip
RAM
USB
PF5
MD1
PUPDPLS
1
0
VBUS
USB+
USB-
Rs
Data transmission/
reception
Rs
1.5 kΩ
MD2
0
Figure 25.9 System Configuration in USB Boot Mode