r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 958

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

Section 22 Flash Memory
• Be sure to initialize both the erasing program and programming program.
22.5.3
This LSI has user boot mode which is initiated with different mode pin settings than those in user
program mode or boot mode. User boot mode is a user-arbitrary boot mode, unlike boot mode that
uses the on-chip SCI.
Only the user MAT can be programmed/erased in user boot mode. Programming/erasing of the
user boot MAT is only enabled in boot mode or programmer mode.
(1) User Boot Mode Initiation
Rev. 1.00 Sep. 21, 2007 Page 932 of 1124
REJ09B0402-0100
In addition to the RAM emulation area, erasing program area, and programming program area,
areas for the user procedure programs, work area, and stack area are reserved in on-chip RAM.
Do not make settings that will overwrite data in these areas.
Initialization by setting the FPEFEQ and FUBRA parameters must be performed for both the
erasing program and the programming program. Initialization must be executed for both entry
addresses: (download start address for erasing program) + 32 bytes (H'FFFF9020 in this
example) and (download start address for programming program) + 32 bytes (H'FFFF9820 in
this example).
For the mode pin settings to start up user boot mode, see table 22.1.
When the reset start is executed in user boot mode, the check routine for flash-memory related
registers runs. The RAM area about 1.2 Kbytes from H'FFFF9800 and 4 bytes from
H'FFFFAFFC (a stack area) is used by the routine. While the check routine is running, NMI
and all other interrupts cannot be accepted. This period is 100 µs while operating at an internal
frequency of 40 MHz.
Next, processing starts from the execution start address of the reset vector in the user boot
MAT. At this point, H'AA is set to the flash MAT select register (FMATS) because the
execution MAT is the user boot MAT.
User Boot Mode