h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 437
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h8s-2172
Manufacturer Part Number
h8s-2172
Description
Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2172.pdf
(570 pages)
- Current page: 437 of 570
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14.4.2
The user MAT can be programmed/erased in user program mode. (The user boot MAT cannot be
programmed/erased.)
Programming/erasing is executed by downloading the program in the microcomputer.
The overview flow is shown in figure 14.9.
High voltage is applied to internal flash memory during the programming/erasing processing.
Therefore, transition to reset or hardware standby must not be executed. Doing so may damage or
destroy flash memory. If reset is executed accidentally, reset must be released after the reset input
period of 100 µs which is longer than normal.
program data is prepared
transferred to the on-chip
Programming/erasing
Programming/erasing
When programming,
Programming/erasing
procedure program is
RAM and executed
User Program Mode
start
end
Figure 14.9 Programming/Erasing Overview Flow
1.
2.
3.
4.
Make sure that the program data will not overlap the download
destination specified by FTDAR..
The FWE bit is set to 1 by inputting a high level signal to the FWE
pin.
Programming/erasing is executed only in the on-chip RAM.
However, if program data is in a consecutive area and can be
accessed by the MOV.B instruction of the CPU like RAM or
ROM, the program data can be in an external space.
After programming/erasing is finished, input a low level signal to
the FWE pin and transfer to the hardware protection state.
Rev. 2.00, 03/04, page 405 of 534
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