Flash Memory - NEC V850ES/DJ2 User Manual

2.22 Flash Memory

The following products are flash memory versions of the V850ES/FG2.
Caution: There are differences in the amount of noise tolerance and noise radiation between
flash memory versions and mask ROM versions. When considering changing from a
flash memory version to a mask ROM version during the process from experimental
manufacturing to mass production, make sure to sufficiently evaluate commercial
samples (CS) (not engineering samples (ES)) of the mask ROM versions.
µPD70F3235 On-chip 256 KB flash memory
When fetching an instruction, 4 bytes of the flash memory can be accessed in 1 clock in the same man-
ner as the mask ROM versions.
The flash memory can be written mounted on the target board (on-board write), by connecting a dedi-
cated flash programmer to the target system.
Flash memory is commonly used in the following development environments and applications.
• For altering software after solder-mounting the V850ES/FG2 on the target system
• For differentiating software in small-scale production of various models.
• For data adjustment when starting mass production
Features
• 4-byte/1-clock access (for instruction fetch access)
• Batch erase or block unit erase
• Communication with dedicated flash programmer via serial interface
• Erase/write voltage: Can be erased or written using a single power supply.
• On-board programming
• Flash memory programming by self writing
Erasure unit
The units in which the 256 or 384 KB flash memory can be erased are as follows.
(1)Batch erasure
The areas of flash memory xx000000H to xx03FFFFH, and xx000000H to xx05FFFFH can be erased
at the same time.
(2)Block erasure
The flash memory can be erased in block units
Block 0:56 KB
Block 1:8 KB
Block 2:56 KB
Block 3:8 KB
Block 4:56 KB
Block 5:56 KB
Block 6:8 KB
Block 7:8 KB
Block 8:32 KB
Block 9:32 KB
Block 10:32 KB
Block 11:32 KB
Note: 8 blocks, blocks 0 to 7, for the 256 KB version (µPD70F3235).
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Chapter 2 V850ES/FG2 Introduction
Note
Preliminary User's Manual U17763EE1V1UD00
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