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H8/3028F Datasheet(PDF) 616 Page - Renesas Technology Corp

Part # H8/3028F
Description  Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
PDF  923 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3028F Datasheet(HTML) 616 Page - Renesas Technology Corp

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Rev. 2.00, 09/03, page 586 of 890
18.4.2
On-Board Programming Modes
Example of Boot Mode Operation
Flash memory
H8/3028F-ZTAT
RAM
Host
Programming control
program
SCI
Application
program
(old version)
New application
program
Flash memory
H8/3028F-ZTAT
RAM
Host
SCI
Application
program
(old version)
Boot program area
New application
program
Flash memory
H8/3028F-ZTAT
RAM
Host
SCI
Flash memory
prewrite-erase
Boot program
New application
program
Flash memory
H8/3028F-ZTAT
Program execution state
RAM
Host
SCI
New application
program
Boot program
Programming control
program
Boot program area
1. Initial state
The old program version or data remains
written in the flash memory. The user should
prepare the programming control program and
new application program beforehand in the
host.
2. Programming control program transfer
When boot mode is entered, the boot program
in the H8/3028F-ZTAT (originally incorporated
in the chip) is started and the programming
control program in the host is transferred to
RAM via SCI communication. The boot
program required for flash memory erasing is
automatically transferred to the RAM boot
program area.
3. Flash memory initialization
The erase program in the boot program area
(in RAM) is executed, and the flash memory is
initialized (to H'FF). In boot mode, total flash
memory erasure is performed, without regard
to blocks.
4. Writing new application program
The programming control program transferred
from the host to RAM is executed, and the new
application program in the host is written into
the flash memory.
Boot program
Boot program
Programming control
program
Boot program area
Programming control
program



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