SH7018 datasheet(347/431 Pages) RENESAS

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16.6.1

Boot Mode

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

host beforehand. The SCI1 to be used is set to channel asynchronous mode.

When a reset-start is executed after the SH7018 pins have been set to boot mode in the power-on

reset state, the boot program built into the SH7018 is started and the programming control

program prepared in the host is serially transmitted to the SH7018 via SCI1 (RxD, TxD). In the

SH7018, the programming control program received via SCI1 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 16.8, and the boot mode execution

procedure in figure 16.9.

RXD

TXD

SCI1

SH7018

Flash memory

Write data reception

Verify data transmission

Host

On-chip RAM

Figure 16.8 System Configuration in Boot Mode

SH7018 Datasheet(PDF) 347 Page - Renesas Technology Corp