D12320VF25V Datasheet, PDF (758/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 17 ROM
17.24.2 User Program Mode
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 programming/erasing overview flow is shown in figure 17.68.
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 cause
damage or destroy flash memory. If reset is executed accidentally, reset must be released after the
reset input period, which is longer than normal 100 μs.
For information on the programming procedure refer to "Programming Procedure in User Program
Mode", and for information on the erasing procedure refer to "Erasing Procedure in User Program
Mode", below.
For the overview of a processing that repeats erasing and programming by downloading the
programming program and the erasing program in separate on-chip ROM areas using FTDAR, see
"Erasing and Programming Procedure in User Program Mode" which appears later in this section.
Programming/erasing
start
When programming,
program data is prepared
Programming/erasing
procedure program is
transferred to the on-chip
RAM and executed
Programming/erasing
end
[1] RAM emulation mode must be canceled
in advance. Download cannot be executed
in emulation mode.
[2] When the program data is made by means
of emulation, use the FTDAR register to change
the download destination. Note that the download
area and the emulation area will overlap if FTDAR
is in its initial status (H'02).
[3] 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
SRAM/ROM, the program data can be in an
external space.
[4] After programming/erasing is finished, the FWE
pin must be protected.
Figure 17.68 Programming/Erasing Overview Flow
Rev.7.00 Feb. 14, 2007 page 724 of 1108
REJ09B0089-0700