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17.22
Overview of Flash Memory (H8S/2319C 0.18µm F-ZTAT)
17.22.1 Features
This LSI has an on-chip 512-kbyte 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 memory MAT is initiated at a power-on reset in user mode: 512 kbytes
The user boot memory MAT is initiated at a power-on reset in user boot mode: 8 kbytes
• 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
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.
• PROM 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.
• 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 reset/hardware standby. 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. 5.00, 12/03, page 664 of 1088
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