H8SLASH3021 datasheet(489/712 Pages) RENESAS

489 / 712 page

15. ROM

Rev.2.00 Mar. 22, 2007 Page 465 of 684

REJ09B0352-0200

15.6.1

Boot Mode

When boot mode is used, the flash memory programming control program must be prepared in the

host beforehand. The SCI channel 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 LSI 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 (in mode 6, H'FFE710) of the user 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.

The system configuration in boot mode is shown in figure 15.6, and the boot mode execution

procedure in figure 15.7.

RXD1

TXD1

SCI1

LSI

Flash memory

Write data reception

Verify data transmission

Host

On-chip RAM

Figure 15.6 System Configuration in Boot Mode

H8/3021 Datasheet(PDF) 489 Page - Renesas Technology Corp