SH7125_08 Datasheet, PDF (595/774 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 17 Flash Memory
Section 17 Flash Memory
This LSI has 128-Kbyte, 64-Kbyte, or 32-Kbyte on-chip flash memory. The flash memory has the
following features.
17.1 Features
• Capacitance
SH71253, SH71243: 128 Kbytes
SH71252, SH71242: 64 Kbytes
SH71241: 32 Kbytes
• Two on-board programming modes and one off-board programming mode
 On-board programming modes
Boot Mode: This mode is a program mode that uses an on-chip SCI interface. The user MAT
can be programmed. This mode can automatically adjust the bit rate between the host and this
LSI.
User Program Mode: The user MAT can be programmed by using the optional interface. This
mode cannot be used in 32-Kbyte on-chip flash memory version.
 Off-board programming mode
This mode uses the dedicated socket adapter and PROM programmer. The user MAT can be
programmed.
• Programming/erasing interface by the download of on-chip program
This LSI has a dedicated programming/erasing program. After downloading this program to
the on-chip RAM, programming/erasing can be performed by setting the argument parameter.
The user branch is also supported.
 User branch
The program processing is performed in 128-byte units. It consists the program pulse
application, verify read, and several other steps. Erasing is performed in one divided-block
units and consists of several steps. The user processing routine can be executed between the
steps, this setting for which is called the user branch addition.
• Protection modes
There are two protection modes. Software protection by the register setting and hardware
protection by the FWE pin. The protection state for flash memory programming/erasing can be
set.
When abnormalities, such as runaway of programming/erasing are detected, these modes enter
the error protection state and the programming/erasing processing is suspended.
Rev. 4.00 Jul. 25, 2008 Page 575 of 750
REJ09B0243-0400