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CHAPTER 21 FLASH MEMORY
21.1 Overview of Flash Memory
MB91FV150 and MB91F155A have a 510 Kbyte memory(4Mbit). These use a flash
memory that supports to batch-erase all sectors with the 3-V single power supply,
erase in units of sector s and write in half word (16 bits) units with the FR-CPU.
I Overview of flash memory
The flash memory in this device is a internal flash memory operating on 3 V. This flash memory
is the same as the Fujitsu 2 megabit (512 Kb x 8 / 256 Kb x 16) flash memory MBM29LV400C
except for a slight difference in the sector configuration. Writing to this flash memory from an
external device with a ROM writer is also supported.
In addition to the functions that are equivalent to those of the MBM29LV400C, when this flash
memory is used as the internal ROM of the FR-CPU, data and instructions can also be read in
word (32 bits) units. This enables high-speed device operation.
Also see the MBM29LV400C Data Sheet supplied with this manual.
In the MB91FV150 and MB91F155A, the following functions are implemented by combining
flash memory macros with FR-CPU interface circuits:
•
CPU program/data storage memory function
•
When this flash memory is used as ROM, 32-bit access is supported.
•
Read, write, and erase (automatic program algorithm(*1)) via the CPU are supported.
•
Functions equivalent to those of the MBM29LV400C (unit flash memory product)
•
Read, write, and erase (automatic program algorithm(*1)) via ROM writer are supported.
This section describes how to use this flash memory from the FR-CPU.
For details on how to use this flash memory from the ROM writer, see the separate ROM Writer
User's Guide.
*1: Automatic program algorithm = Embedded Algorithm
Embedded Algorithm
414
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