r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 948

• Manufacturer Part Number: r5f71374an80fpv
• Description: 32-bit Risc Microcomputer Superh?? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

Section 22 Flash Memory
22.5.2
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 22.9.
High voltage is applied to internal flash memory during the programming/erasing processing.
Therefore, transition to reset must not be executed. Doing so may cause damage or destroy flash
memory. If reset is executed accidentally, the reset signal must be released after the reset input
period, which is longer than the normal 100 µs.
For details on the programming procedure, see the description in section 22.5.2 (2), Programming
Procedure in User Program Mode. For details on the erasing procedure, see the description in
section 22.5.2 (3), Erasing Procedure in User Program Mode.
Rev. 1.00 Sep. 21, 2007 Page 922 of 1124
REJ09B0402-0100
User Program Mode
program data is prepared
transferred to the on-chip
Programming/erasing
Programming/erasing
When programming,
Programming/erasing
procedure program is
RAM and executed
Figure 22.9 Programming/Erasing Overview Flow
FWE=1 ?
start
end
Yes
No
1. RAM emulation mode must be canceled
2. When the program data is made by means
3. Inputting high level to the FWE pin sets the
4. Programming/erasing is executed only in
5. After programming/erasing is finished, low level
changed by FTDAR.
must be input to the FWE pin for protection.
in advance. Download cannot be executed
in emulation mode.
of emulation, the download destination must be
FWE bit to 1.
the on-chip RAM. However, if the program data
is in a consecutive area and can be accessed
by the MOV.B instruction of the CPU like
SRAM/ROM, the program data can be in an
external space.