Datasheet

Section 21 Flash Memory
R01UH0310EJ0500 Rev. 5.00 Page 1099 of 1384
Sep 25, 2012
H8S/2426, H8S/2426R, H8S/2424 Group
21.8 Boot Mode
Setting the mode pins to mode 3 and resetting the hardware shifts the flash memory into boot
mode. In this mode, the embedded standard program is executed.
21.9 SCI Boot Mode
SCI boot mode executes programming/erasing of the user ROM by means of the control command
and program data transmitted from the externally connected host via the on-chip SCI_1.
In SCI boot mode, the tool for transmitting the control command and program data, and the
program data must be prepared in the host. The serial communication mode is set to asynchronous
mode. The system configuration in SCI boot mode is shown in figure 21.7. Interrupts are ignored
in SCI boot mode. Configure the user system so that interrupts do not occur.
RxD1
T
xD1
Software for
analyzing
control
commands
(on-chip)
Flash
memory
On-chip
RAM
SCI_1
This LSI
MD2 to MD0 011
Host
Programming
tool and program
data
Control command,
program data
Response
Figure 21.7 System Configuration in SCI Boot Mode