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17.4.1
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 pins of the H8/3062F-ZTAT or H8/3062F-ZTAT
R-mask version to boot mode, the boot program already incorporated in the MCU is activated, the
low period of the data sent from the host is first measured, and the bit rate register (BRR) value
determined. It is then possible to receive a user program from off-chip using the on-chip serial
communication interface (SCI) in the H8/3062F-ZTAT or H8/3062F-ZTAT R-mask version, and
the received user program is written into the on-chip RAM.
Control then branches to the start address H'FFF400 of the on-chip RAM, the program written in
RAM is executed, and flash memory programming/erasing can be carried out.
Figure 17.5 shows a system configuration diagram when using boot mode, and figure 17.6 shows
the boot program mode execution procedure.
Host
Figure 17.5 System Configuration When Using Boot Mode
Reception of programming data
Transmission of verify data
H8/3062F-ZTAT or
H8/3062F-ZTAT R-mask version
Flash memory
RXD1
SCI1
On-chip RAM
TXD1
489
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