This Data Sheet may be revised by subsequent versions

©2004 Eon Silicon Solution, Inc., www.essi.com.tw

or modifications due to changes in technical specifications.

9

EN25F80

Rev. E, Issue Date: 2007/11/23

read Device ID

Release from Deep

Power-down

Manufacturer/

Device ID

90h

dummy

dummy

00h(5)

(M7-M0)

(ID7-ID0)

Read Identification

9Fh

(M7-M0)

(ID15-ID8)

(ID7-ID0)

Enter OTP mode

3Ah

Notes:

1. Data bytes are shifted with Most Significant Bit first. Byte fields with data in parenthesis “( )” indicate data being read from

the device on the DO pin.

2. The Status Register contents will repeat continuously until CS# terminate the instruction.

3. All sectors may use any address within the sector.

4. The Device ID will repeat continuously until CS# terminate the instruction.

5. The Manufacturer ID and Device ID bytes will repeat continuously until CS# terminate the instruction.

00h on Byte 4 starts with MID and alternate with DID, 01h on Byte 4 starts with DID and alternate with MID.

Table 5. Manufacturer and Device Identification

OP Code

(M7-M0)

(ID15-ID0)

(ID7-ID0)

ABh

13h

90h

1Ch

13h

9Fh

1Ch

3114h

Write Enable (WREN) (06h)

The Write Enable (WREN) instruction (Figure 5) sets the Write Enable Latch (WEL) bit. The Write

Enable Latch (WEL) bit must be set prior to every Page Program (PP), Sector Erase (SE), Block

Erase (BE), Chip Erase (CE) and Write Status Register (WRSR) instruction.

The Write Enable (WREN) instruction is entered by driving Chip Select (CS#) Low, sending the

instruction code, and then driving Chip Select (CS#) High.

Figure 5. Write Enable Instruction Sequence Diagram

Write Disable (WRDI) (04h)

The Write Disable instruction (Figure 6) resets the Write Enable Latch (WEL) bit in the Status

Register to a 0 or exit from OTP mode to normal mode. The Write Disable instruction is entered by

driving Chip Select (CS#) low, shifting the instruction code “04h” into the DI pin and then driving Chip

Select (CS#) high. Note that the WEL bit is automatically reset after Power-up and upon completion

of the Write Status Register, Page Program, Sector Erase, Block Erase (BE) and Chip Erase

instructions.