Setting The Flash Memory In The Read Or Reset Status - Fujitsu F2MC-16LX Hardware Manual

CHAPTER 23 1M-BIT FLASH MEMORY

23.7.1 Setting the Flash Memory in the Read or Reset Status

This section describes the procedure for setting the flash memory in the read or reset
status by issuing the read or reset command.
■ Setting the Flash Memory to the Read or Reset Status
The flash memory can be set to the read or reset status by continuously sending read or reset
commands, listed in the command sequence table (see Table 23.5-1 in Section "23.5 Activating
the Automatic Algorithm of the Flash Memory"), to the target sector in the flash memory.
The read and reset commands have the following two command sequence types: one-bus
operation and three-bus operation, though there is no essential difference between the two.
The read and reset statuses are initial statuses of the flash memory. At power-on or normal
operation of the command, the flash memory is always set to a read and reset status. In these
statuses, the system waits for other commands to be input.
In the read and reset statuses, data can be read by an ordinary read access. As with the mask
ROM, a program access from the CPU is possible. The read and reset commands are not
needed to read data at ordinary reading.
commands are used primarily to initialize the automatic algorithm.
358
If a command does not end normally, these