D12320VF25IV Datasheet, PDF (791/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 19 ROM
19.6.1 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/2329B F-ZTAT chip’s pins have been set to boot
mode, the boot program built into the chip is started and the programming control program
prepared in the host is serially transmitted to the chip via the SCI. In the chip, 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 19.9, and the boot program mode
execution procedure in figure 19.10.
Chip
Flash memory
Host
Write data reception
Verify data transmission
RxD1
SCI1
TxD1
On-chip RAM
Figure 19.9 System Configuration in Boot Mode
Rev.6.00 Sep. 27, 2007 Page 759 of 1268
REJ09B0220-0600