HD64F3028F25 Datasheet, PDF (624/925 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

18.5.1 Boot Mode
When boot mode is used, a flash memory programming control program must be prepared
beforehand in the host, and SCI channel 1, which is to be used, must be set to asynchronous mode.
When a reset-start is executed after setting the H8/3028F-ZTAT’ pins to boot mode, the boot
program already incorporated in the MCU is activated, and the programming control program
prepared beforehand in the host is transmitted sequentially to the H8/3028F-ZTAT, using the SCI.
In the H8/3028F-ZTAT, 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 (H'FFC720) of the programming control program area and the
programming control program execution state is entered (flash memory programming/erasing can
be performed).
Figure 18.5 shows a system configuration diagram when using boot mode, and figure 18.6 shows
the boot program mode execution procedure.
H8/3028F-ZTAT
Host
Flash memory
Reception of programming data
Transmission of verify data
RxD1
SCI1
TxD1
On-chip RAM
Figure 18.5 System Configuration When Using Boot Mode
Rev. 2.00, 09/03, page 592 of 890