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H8/3021 Datasheet(PDF) 473 Page - Renesas Technology Corp

Part # H8/3021
Description  16-Bit Single-Chip Microcomputer
PDF  712 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3021 Datasheet(HTML) 473 Page - Renesas Technology Corp

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15. ROM
Rev.2.00 Mar. 22, 2007 Page 449 of 684
REJ09B0352-0200
15.2.3
On-Board Programming Modes
Boot Mode (Example)
Flash memory
H8/3022
RAM
Host
Programming control
program
SCI
Application program
(old version)
New application
program
Flash memory
H8/3022
RAM
Host
SCI
Application program
(old version)
Boot program area
New application
program
Flash memory
H8/3022
RAM
Host
SCI
Flash memory
preprogramming
erase
Boot program
New application
program
Flash memory
H8/3022
Program execution state
RAM
Host
SCI
New application
program
Boot program
Programming control
program
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 H8/3022 (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.
Programming control
program
Boot program
Boot program
Boot program area
Boot program area
Programming control
program



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