HD6432142 datasheet(700/1177 Pages) RENESAS

700 / 1177 page

Section 22 ROM (Mask ROM Version, H8S/2148 F-ZTAT, H8S/2147N F-ZTAT, H8S/2144 F-ZTAT, and H8S/2142 F-ZTAT)

Rev. 4.00 Sep 27, 2006 page 656 of 1130

REJ09B0327-0400

22.6.1

Boot Mode

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

host beforehand. The channel 1 SCI to be used is set to asynchronous mode.

When a reset-start is executed after this group MCU’s pins have been set to boot mode, the boot

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

is serially transmitted to the MCU via the SCI. In the MCU, 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 22.7, and the boot program mode

execution procedure in figure 22.8.

RxD1

TxD1

SCI1

This group chip

Flash memory

Write data reception

Verify data transmission

Host

On-chip RAM

Figure 22.7 System Configuration in Boot Mode

HD6432142 Datasheet(PDF) 700 Page - Renesas Technology Corp