SH7055S Datasheet, PDF (773/1002 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7000 Series

Section 22 ROM
22.1 Features
This LSI has 512-kbyte on-chip flash memory. The flash memory has the following features.
• Two flash-memory MATs according to LSI initiation mode
The on-chip flash memory has two memory spaces in the same address space (hereafter
referred to as memory MATs). The mode setting in the initiation determines which memory
MAT is initiated first. The MAT can be switched by using the bank-switching method after
initiation.
 The user MAT is initiated at a power-on reset in user mode: 512 kbytes
 The user boot MAT is initiated at a power-on reset in user boot mode: 8 kbytes
• Three 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 and user boot 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.
User Boot Mode: The user boot program of the optional interface can be made and the
user MAT can be programmed.
 Off-board programming mode
Programmer Mode: This mode uses the PROM programmer. The user MAT and user
boot 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.
• Emulation function of flash memory by using the on-chip RAM
As flash memory is overlapped with part of the on-chip RAM, the flash memory programming
can be emulated in real time.
• 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.
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