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Section 25 Flash Memory
25.4.1
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 25.6. For details on the pin
setting in boot mode, see table 25.5. The NMI and other interrupts are ignored in boot mode.
However, the NMI and other interrupts should be disabled in the user system.
Host
Boot
programming
tool and program
data
Rev. 1.00 Mar. 12, 2008 Page 948 of 1178
REJ09B0403-0100
Control command, program data
Reply response
Figure 25.6 System Configuration in Boot Mode
This LSI
Control command,
analysis execution
software (on-chip)
RxD1
On-chip SCI_1
On-chip RAM
TxD1
Flash
memory
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