H8SLASH3028F datasheet(622/923 Pages) RENESAS

622 / 923 page

Rev. 2.00, 09/03, page 592 of 890

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.

RxD1

TxD1

SCI1

H8/3028F-ZTAT

Flash memory

Reception of programming data

Transmission of verify data

Host

On-chip RAM

Figure 18.5 System Configuration When Using Boot Mode

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