SH7055S Datasheet, PDF (836/1002 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7000 Series

 Boot mode
 Programmer mode
 Checking the flash-memory related registers immediately after user boot mode is initiated
(Approximately 100 µs when operation with internal frequency of 40 MHz is carried out
after the reset signal is released.)
5. Compatibility with programming/erasing program of conventional F-ZTAT SH
microcomputer
A programming/erasing program for flash memory used in the conventional F-ZTAT SH
microcomputer which does not support download of the on-chip program by a SCO transfer
request cannot run in this LSI.
Be sure to download the on-chip program to execute programming/erasing of flash memory in
this LSI.
6. Monitoring runaway by WDT
Unlike the conventional F-ZTAT SH microcomputer, no countermeasures are available for a
runaway by WDT during programming/erasing by the downloaded on-chip program.
Prepare countermeasures (e.g. use of the user branch routine and periodic timer interrupts) for
WDT while taking the programming/erasing time into consideration as required.
22.9 Programmer Mode
Along with its on-board programming mode, this LSI also has programmer mode as another mode
for writing and erasing of programs and data. Programmer mode supports memory-read mode,
auto-program mode, auto-erase mode, and status-read mode. Programming/erasing is possible on
the user MAT and user boot MAT.
A status-polling system is adopted for operation in auto-program mode, auto-erase mode, and
status-read mode. In status-read mode, details of the system's internal state are output after
execution of automatic programming or automatic erasure.
In programmer mode, set the mode pins as shown in table 22.13, and provide a 6-MHz input-clock
signal.
Rev.2.0, 07/03, page 798 of 960