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LE25U20AMB
Device Operation
The LE25U20AMB features electrical on-chip erase functions using a single 2.5V power supply, that have been added
to the EPROM functions of the industry standard that support serial interfaces. Interfacing and control are facilitated by
incorporating the command registers inside the chip. The read, erase, program and other required functions of the
device are executed through the command registers. The command addresses and data input in accordance with "Table
2 Command Settings" are latched inside the device in order to execute the required operations. "Figure 3 Serial Input
Timing" shows the timing waveforms of the serial data input. First, at the falling CS edge the device is selected, and
serial input is enabled for the commands, addresses, etc. These inputs are introduced internally in sequence starting with
bit 7 in synchronization with the rising SCK edge. At this time, output pin SO is in the high-impedance state. The
output pin is placed in the low-impedance state when the data is output in sequence starting with bit 7 synchronized to
the falling clock edge during read, status register read and silicon ID. Refer to "Figure 4 Serial Output Timing" for the
serial output timing.
The LE25U20AMB 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.
Table 2 Command Settings
Command
1st bus cycle
2nd bus cycle
3rd bus cycle
4th bus cycle
5th bus cycle
6th bus cycle
Nth bus cycle
Read
03h
A23-A16
A15-A8
A7-A0
0Bh
A23-A16
A15-A8
A7-A0
X
Small sector erase
Sector erase
D7h/20h
D8h
A23-A16
A23-A16
A15-A8
A15-A8
A7-A0
A7-A0
Chip erase
C7h
Page program
02h
A23-A16
A15-A8
A7-A0
PD *
PD *
PD *
Write enable
Write disable
Power down
Status register read
06h
04h
B9h
05h
Status register write
Read silicon ID 1
01h
9Fh
DATA
Read silicon ID 2
ABh
X
X
X
Exit power down mode
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 A18 for all commands are "Don't care".
In order for commands other than the read command to be recognized, CS must rise after all the bus cycle input.
*: "PD" stands for page program data.
No.A2097-4/21
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