Fujitsu F2MC-16LX Hardware Manual page 489
Mb90470 series 16-bit microcontroller
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Also See for F2MC-16LX:
- Hardware manual (706 pages) ,
- Application note (13 pages) ,
- Operation manual (10 pages)
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[Bit 5] WE: Write Enable
This bit is a write-enable bit for the flash memory area.
If this bit is "1", a command sequence that targets banks FC - FF (refer to Section 26.4
"Method for Starting the Flash Memory's Automatic Algorithm") will result in a write/erase
operation in the flash memory area. If this bit is "0", no write/erase signals are generated.
This bit is used for initiating write/erase commands with respect to the flash memory.
In order to prevent accidental writing of any data to the flash memory, Fujitsu recommends
always setting this bit to "0" whenever no write/erase operations are to be executed.
0
Flash memory write/erase prohibited
1
Flash memory write/erase allowed
[Bit 4] RDY: ReadDY
This bit is used to allow flash memory write/erase operations to be performed.
If this bit is "0", write/erase operations with respect to the flash memory are not allowed.
However, suspend commands, such as read/reset and sector erase suspend, can be
accepted in this state.
0
Write/erase operation in progress
1
End of write/erase operation (next data write/erase operation is enabled)
[Bit 3] Reserve bit
This bit is reserved. Always set this bit to "0" for ordinary use.
[Bit 1] Unused bit
This bit is unused. Always set this bit to "0" for ordinary use.
[Bit 2, 0] LPM1, LPM0: Low Power Mode
These bits are used to reduce flash memory power consumption. If these bits are set to "00",
flash memory operations are performed normally. If these bits are set to "01", "10" or "11",
however, access to flash memory according to the select signal will be performed in low
power consumption mode. In this case, access time increases significantly compared to
access with LPM = "00", and memory access will be disabled during high-speed operation of
the CPU. To use this mode, use a CPU with a frequency 4 MHz, 8 MHz, or 10 MHz.
LPM1 LPM0
0
0
Normal power consumption mode
0
1
Power saving mode (operation with an internal operation frequency of 4MHz)
1
0
Power saving mode (operation with an internal operation frequency of 8MHz)
1
1
Power saving mode (operation with an internal operation frequency of 10MHz)
Note:
•
For a CPU operation frequency of 10 MHz or higher, always use normal mode.
CHAPTER 26 2M BIT FLASH MEMORY
Power consumption mode
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