h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 815

• Manufacturer Part Number: h8s-2635
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

21A.8.1 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 the LSI’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, 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 21A-7, and the boot mode execution
procedure in figure 21A-8.
Host
Figure 21A-7 System Configuration in Boot Mode
Verify data transmission
Write data reception
Rev. 6.00 Feb 22, 2005 page 755 of 1484
RxD1
TxD1
Section 21A ROM (H8S/2636 Group)
SCI1
LSI
Flash memory
On-chip RAM
REJ09B0103-0600