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LE25S40MB
Device Operation
The read, erase, program and other required functions of the device are executed through the command registers. The
serial I/O corrugate is shown in Figure 3 and the command list is shown in Table 2. At the falling CS edge the device is
selected, and serial input is enabled for the commands, addresses, etc. These inputs are normalized in 8 bit units and
taken into the device interior in synchronization with the rising edge of SCK, which causes the device to execute
operation according to the command that is input.
The LE25S40MB supports both serial interface SPI mode 0 and SPI mode 3. At the falling CS edge, SPI mode 0 is
automatically selected if the logic level of SCK is low, and SPI mode 3 is automatically selected if the logic level of
SCK is high.
Figure 3 I/O waveforms
CS
Mode3
SCK
Mode0
8CLK
SI
MSB
(Bit7)
1st bus
LSB
(Bit0)
2nd bus
Nth bus
SO
High Impedance
DATA
DATA
Table 2 Command Settings
Read
Command
1st bus cycle
03h
0Bh
2nd bus cycle
A23-A16
A23-A16
3rd bus cycle
A15-A8
A15-A8
4th bus cycle
A7-A0
A7-A0
5th bus cycle
RD *1
X
6th bus cycle
RD *1
RD *1
Nth bus cycle
RD *1
RD *1
Small sector erase
Sector erase
20h / D7h
D8h
A23-A16
A23-A16
A15-A8
A15-A8
A7-A0
A7-A0
Chip erase
60h / C7h
Page program
02h
A23-A16
A15-A8
A7-A0
PD *2
PD *2
PD *2
Write enable
Write disable
Power down
Status register read
06h
04h
B9h
05h
Status register write
JEDEC ID read
01h
9Fh
DATA
ID read
ABh
X
X
X
power down
Exit power down mode
B9h
ABh
Explanatory notes for Table 2
"X" signifies "don't care" (that is to say, any value may be input).
The "h" following each code indicates that the number given is in hexadecimal notation.
Addresses A23 to A19 for all commands are "Don't care".
*1: "RD" stands for read data. *2: "PD" stands for page program data.
No.A2096-4/22
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