HD64F3048VTF8 Datasheet, PDF (621/903 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip

Section 18 ROM (H8/3048F-ONE: Single Power Supply, H8/3048B Mask ROM Version)
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 channel to be used is set to asynchronous mode.
When a reset-start is executed after H8/3048F-ONE’s pins have been set to boot mode, the boot
program built into the LSI is started and the programming control program prepared in the host is
serially transmitted to the LSI via the SCI. In the LSI, 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, the programming control program is recognized (the ID code is checked) if
it corresponds to the H8/3048F-ONE. When the ID code is matched, 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 18.7, and the boot mode execution
procedure in figure 18.8.
H8/3048F-ONE
Flash memory
Host
Write data reception
Verify data transmission
RxD1*
SCI1
TxD1*
On-chip RAM
Note: * For pins RxD1 and TxD1, use on-board pull-up.
Figure 18.7 System Configuration in Boot Mode
Rev. 3.00 Sep 27, 2006 page 593 of 872
REJ09B0325-0300