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Section 25 Flash Memory
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
Figure 25.9 System Configuration in USB Boot Mode
Rev. 1.00 Mar. 12, 2008 Page 952 of 1178
REJ09B0403-0100
PUPDPLS
1.5 kΩ
Rs
USB+
Rs
USB-
Data transmission/
reception
VBUS
This LSI
Software for
analyzing
Flash
control
memory
commands
(on-chip)
On-chip
RAM
USB
1
PF5
MD2
0
MD1
0
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