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CHAPTER 19 512 KBIT FLASH MEMORY
19.8.1
Read/Reset State in Flash Memory
This section explains the procedure for inputting the read/reset command to place flash
memory in the read/reset state.
I Read/Reset State in Flash Memory
• Flash memory can be placed in the read/reset state by transmitting the read/reset command in
the command sequence table from CPU to flash memory.
• There are two kinds of read/reset commands: one is executed at one time bus operation, and
the other is executed at three times bus operation; the command sequence of both is
essentially the same.
• Since the read/reset state is the initial state for flash memory, flash memory always enters this
state after power-on and at the normal termination of command. The read/reset state is also
described as the wait state for command input.
• In the read/reset state, a read access to flash memory enables data to be read. As is the case
with mask ROM, a program access from the CPU can be made.
• A read access to flash memory does not require the read/reset command. If the command is
not terminated normally, use the read/reset command to initialize the automatic algorithm.
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