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Preliminary User’s Manual U14913EE1V0UM00
Chapter 20
Flash Memory (µPD70F3123)
The µPD70F3123 is the flash memory version of V850E/CA1 / ATOMIC, and is provided with a 256 KB
flash memory. An instruction fetch from the flash memory takes one clock.
The flash memory can be programmed using a dedicated flash writer. Furthermore this product has a
Selfprogramming mode, which allows to program the flash memory by control of the application without
any dedicated writer.
The following can be considered as the development environment and the application using a flash
memory:
• Software can be altered after the µPD70F3123 is solder mounted on the target system.
• Small scale production of various models is made easier by differentiating software.
• Data adjustment in starting mass production is made easier.
• Alter the software in the field using the Selfprogramming option.
20.1 Features
•
4-byte (1-word) access in 1 clock (instruction fetch access)
•
Entire flash memory is divided into 2 areas, which can be erased separately
- Area 0: 128 K
- Area 1: 128 K
•
Communication through serial interfaces (CSI0) from the dedicated flash writer
•
Erase/write voltage: V
PP
= 7.8 V
•
On-board programming using flash writer
•
Selfprogramming mode
•
After erase flash memory becomes FFFFFFFFH
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