Datasheet

Section 22 Flash Memory
Page 1166 of 1408 R01UH0309EJ0500 Rev. 5.00
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
22.9 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 22.7. 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
P27 and P26
MD2 to MD0
00
011
Host
Programming
tool and program
data
Control command,
program data
Response
Figure 22.7 System Configuration in SCI Boot Mode