h8s-2169 Renesas Electronics Corporation., h8s-2169 Datasheet - Page 722
h8s-2169
Manufacturer Part Number
h8s-2169
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2169.pdf
(1075 pages)
- Current page: 722 of 1075
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Section 22 ROM
Rev. 3.00 Jan 18, 2006 page 694 of 1044
REJ09B0280-0300
User program mode
1. Initial state
3. Flash memory initialization
(1) the program that will transfer the
programming/ erase control program to on-chip
RAM should be written into the flash memory by
the user beforehand. (2) The programming/erase
control program should be prepared in the host
or in the flash memory.
The programming/erase program in RAM is
executed, and the flash memory is initialized (to
H'FF). Erasing can be performed in block units,
but not in byte units.
The chip
The chip
Application program
Transfer program
Transfer program
Flash memory
Flash memory
Flash memory
Boot program
Boot program
(old version)
erase
erase control program
New application
New application
Programming/
program
program
Host
Host
Figure 22.5 User Program Mode (Example)
erase control program
Programming/
RAM
RAM
SCI
SCI
2. Programming/erase control program transfer
4. Writing new application program
The chip
The chip
The transfer program in the flash memory is
executed, and the programming/erase control
program is transferred to RAM.
Next, the new application program in the host is
written into the erased flash memory blocks. Do
not write to unerased blocks.
Application program
Transfer program
New application
Transfer program
Flash memory
Flash memory
Boot program
Boot program
(old version)
program
New application
program
Host
Host
erase control program
erase control program
Programming/
Programming/
Program execution state
RAM
RAM
SCI
SCI
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