Rev. 1.0, 02/00, page 141 of 1141
7.4.1
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.
When a reset-start is executed after the LSI’s pins have been set to boot mode, the boot program
built into the MCU is started and the programming control program prepared in the host is serially
transmitted to the LSI via the SCI. In the LSI, the programming control program received via the
SCI is written into the programming control program area in on-chip RAM. After the transfer is
completed, control branches to the start address of the programming control program area and the
programming control program execution state is entered (flash memory programming is
performed).
The transferred programming control program must therefore include coding that follows the
programming algorithm given later.
Figure 7.7 shows the system configuration in boot mode. Figure 7.8 shows the boot program mode
execution procedure.
SI1
SO1
SCI1
This LSI
Flash memory
Write data reception
Verify data
transmission
Host
On-chip RAM
Figure 7.7 System Configuration in Boot Mode