
18-1
MSM66573 Family User's Manual
Chapter 18 Flash Memory
18
18. Flash Memory
18.1 Overview
The MSM66573 family provides a flash ROM version, which is equipped with an electrically
programmable non-volatile memory (64KB flash memory) as the internal program memory.
With three types of flash memory programming modes, the flash ROM version can be
programmed even after being installed in a system.
There are two versions of MSM66Q573 devices: the MSM66Q573 operates in the range
of 4.5 to 5.5 V and the MSM66Q573L operates in the range of 2.4 to 3.6 V. Select the device
that matches the voltage range to be used.
18.2 Features
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Power supply voltage
MSM66Q573 (4.5 to 5.5 V operation) … Can be programmed with a single 4.5 to 5.5 V
power supply
MSM66Q573L (2.4 to 3.6 V operation) … Can be programmed with a single 2.4 to 3.6 V
power supply
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Programming modes
Flash memory has the following three programming modes.
Parallel mode
…
Can be programmed with a Minato Electronics' PROM writer.
Serial mode
…
Can be programmed with a flash memory writer
(of YDC or Oki Electric Ind. make)
User mode
…
Can be programmed by program execution.
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Programming blocks
Flash memory is programmed in blocks of 128-byte units.
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Auto-erase function
Since an auto-erase function is provided to automatically erase the block to be written to
prior to programming, it is unnecessary to erase flash memory before programming.
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Programming Time
Programming time for the flash memory is listed below.
Programming (128 byte unit) … Approx. 40 ms (at 4.5 to 5.5 V)
Approx. 50 ms (at 2.4 to 3.6 V)
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Write protect function
Flash memory has a built-in power-on write protect function that automatically disables
programming for approximately 20 ms after power is turned on.
In addition, there is an acceptor function to prevent incorrect programming in the user mode
due to a running of out-of-control program.