Read/Reset Status - Fujitsu FR60 Hardware Manual

CHAPTER 17 FLASH MEMORY
17.5.1

Read/Reset Status

This section explains how to issue read/reset commands to set flash memory into read/
reset status.
■ Reading/Resetting Flash Memory
The read/reset operation becomes possible by continuously sending read/reset commands (listed in the
command sequence table) to target sectors in flash memory.
A bus operation is performed one or three times with a read/reset command sequence. There is no essential
difference between these two sequences. Read/reset status is the initial status of flash memory, and flash
memory is set in this status at power-on or when a command terminates normally. In this status, the system
waits for a command other than read/reset to be entered.
Data can be read using normal read access in this status. Programs can be accessed from the CPU the same
way the programs in mask ROM are accessed. The read/reset command is not necessary for reading data in
normal read access. This command is required, however, to initialize the automatic algorithm if a command
does not terminate normally.
558