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15.4.1
Boot Mode
When boot mode is used, the flash memory programming control program must be prepared in the
host beforehand. The channel 1 SCI to be used is set to asynchronous mode.
In reset start, after setting this LSI pin to the boot mode, start the microcomputer boot program,
measure the Low period of the data sent from the host, and select the bit rate register (BRR) value
beforehand. Then enable reception of the user program from the outside using the serial
communication interface (SCI) on this LSI, and write the received user program to on-chip RAM.
After the program has been stored the end of writing, execution branches to the top address
(H'FF300) of the on-chip RAM, execute the program written on the on-chip RAM, and enable
flash memory program/erase.
The system configuration in boot mode is shown in figure 15-5, and the boot program mode
execution procedure in figure 15-6.
Host
452
Write data reception
Verify data transmission
Figure 15-5 System Configuration in Boot Mode
Flash memory
RXD
1
SCI1
TXD
1
This LSI
On-chip RAM
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