SH7014 datasheet(539/754 Pages) RENESAS

539 / 754 page

18. 128 kB Flash Memory (F-ZTAT)

Rev.5.00 Sep. 27, 2007 Page 505 of 716

REJ09B0398-0500

18.6.1

Boot Mode

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

host beforehand. The SCI to be used is set to channel asynchronous mode.

When a reset-start is executed after the SH7017 pins have been set to boot mode, the boot program

built into the SH7017 is started and the programming control program prepared in the host is

serially transmitted to the SH7017 via the SCI. In the SH7017, 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.

The system configuration in boot mode is shown in figure 18.8, and the boot mode execution

procedure in figure 18.9.

RXD1

TXD1

SCI1

SH7017

Flash memory

Write data reception

Verify data transmission

Host

On-chip RAM

Figure 18.8 System Configuration in Boot Mode

SH7014 Datasheet(PDF) 539 Page - Renesas Technology Corp