Fujitsu F2MC-16LX Hardware Manual page 583

[bit 5] WE: Write Enable
It is a write enable bit to the flash memory area.
When the setting is "1", writing after issuing command sequences for F9 to FB, FD to FF banks (see
"25.4 Automatic Algorithm Initiation Method of Flash Memory") is executed on the area in the flash
memory. The signal of writing/ deletion is not generated at "0". It is used for activating the write/erase
command of flash memory.
In order to avoid erroneous data writing to the flash memory, it is recommended to set "0" permanently
when the writing/erasing command is not used.
0
1
[bit 4] RDY: ReaDY
This is the writing/erasing permission bit of flash memory.
While this is "0", the writing/erasing flash memory are disabled. However, the read/reset command or
sector erase suspend command is enabled in this state.
0
1
[bit 3] Reserved bit
It is Reserved bit. Be sure to set to "0" in the normal operation.
[bit 1] Reserved bit
It is a Reserved bit. Be sure to set to "0" in the normal operation.
[bit 2, bit 0] LPM1,LPM0:Low Power Mode
This bit controls the power consumption of the flash memory. The flash memory becomes a normal
operation at "00
the flash memory device is reduced with the select signal for the flash memory at the time of accessing
the flash memory. However, the memory access is disabled when the CPU is operating at a high speed
because the access time increases significantly compared to the condition in LPM= "00
LPM1
0
0
1
1
Notes:
• Be sure to use under the normal mode when the CPU operation frequency is 10 MHz or higher.
• As for the FMCS register, only byte access is possible.
• When using the sub-clock, operate at the low power consumption mode irrespective of the setting
for LPM.
Writing Erasing on Flash Memory disabled
Writing Erasing on Flash Memory enabled
During writing/ deletion operation execution
Completion of writing/erasing operation (write/erase the next data enabled)
". In addition, when this bit is set to "01
B
LPM0
0 Normal power consumption mode
1
0 Low power consumption mode
1
CHAPTER 25 3M-BIT FLASH MEMORY
", "10 ", or "11
B B
Power consumption mode
", the power consumption of
B
".
B
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