HD6432138SW datasheet(648/1061 Pages) RENESAS

648 / 1061 page

Section 21 ROM (Mask ROM Version, H8S/2138 F-ZTAT, H8S/2134 F-ZTAT, and H8S/2132 F-ZTAT)

Rev. 4.00 Jun 06, 2006 page 594 of 1004

REJ09B0301-0400

21.6.1

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 the H8S/2138 or H8S/2134 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 21.7, and the boot program mode

execution procedure in figure 21.8.

RxD1

TxD1

SCI1

The chip

Flash memory

Write data reception

Verify data transmission

Host

On-chip RAM

Figure 21.7 System Configuration in Boot Mode

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