Datasheet
Section 19 Flash Memory
Rev. 3.00 Sep. 28, 2009 Page 539 of 710
REJ09B0384-0300
19.4.1 Boot Mode
Boot mode executes programming/erasing user MAT and user boot MAT by means of the control
command and program data transmitted from the host using the on-chip SCI. The tool for
transmitting the control command and program data must be prepared in the host. The SCI
communication mode is set to asynchronous mode. When reset start is executed after this LSI’s
pin is set in boot mode, the boot program in the microcomputer is initiated. After the SCI bit rate
is automatically adjusted, the communication with the host is executed by means of the control
command method.
The system configuration diagram in boot mode is shown in figure 19.6. For details on the pin
setting in boot mode, see table 19.5. The NMI and other interrupts are ignored in boot mode.
However, the NMI and other interrupts should be disabled in the user system.
Host
RxD1
T
xD1
Control command,
analysis execution
software (on-chip)
Flash
memory
On-chip RAMOn-chip SCI_1
This LSI
Boot
programming
tool and program
data
Control command, program data
Reply response
Figure 19.6 System Configuration in Boot Mode