Datasheet

Section 22 ROM
Page 962 of 1434 R01UH0166EJ0600 Rev. 6.00
Mar 02, 2011
H8S/2633 Group, H8S/2633 F-ZTAT
TM
,
H8S/2633R F-ZTAT
TM
, H8S/2695
22.6.1 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 the H8S/2633 Group’s pins have been set to boot mode, the
boot program built into the H8S/2633 Group is started and the programming control program
prepared in the host is serially transmitted to the H8S/2633 Group via the SCI. In the H8S/2633
Group, 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 mode execution
procedure in figure 22.8.
RxD2
TxD2
SCI2
H8S/2633 Group
Flash memory
Write data reception
Verify data transmission
Host
On-chip RAM
Figure 22.7 System Configuration in Boot Mode