24AA080-SN Ver la hoja de datos (PDF) - Microchip Technology
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24AA080-SN Datasheet PDF : 12 Pages
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25AA080/160
TABLE 2-1: INSTRUCTION SET
Instruction Name Instruction Format
Description
WREN
WRDI
RDSR
WRSR
READ
WRITE
0000 0110
0000 0100
0000 0101
0000 0001
0000 0011
0000 0010
Set the write enable latch (enable write operations)
Reset the write enable latch (disable write operations)
Read status register
Write status register (write protect enable and block write protection bits)
Read data from memory array beginning at selected address
Write data to memory array beginning at selected address
TABLE 2-2: WRITE PROTECT FUNCTIONALITY MATRIX
WPEN
0
0
1
1
X
X
FIGURE 2-1:
WP
WEL
Protected Blocks Unprotected Blocks
X
0
X
1
Low
0
Low
1
High
0
High
1
Protected
Protected
Protected
Protected
Protected
Protected
Protected
Writable
Protected
Writable
Protected
Writable
WRITE TO STATUS REGISTER AND/OR ARRAY FLOWCHART
Status Register
Protected
Writable
Protected
Protected
Protected
Writable
CS Returns High
Write
No
to Status
Reg?
Yes
No
WEL = 1?
Yes
No
WP is low?
Yes
No
WPEN = 1?
Yes
Write to
Status Register
Do not write to
Status Register
Continue
Write
No
to array?
Yes
No
WEL = 1?
Yes
Write to the
Unprotected Block
To other
Commands
Do not write to
Array
From other
Commands
DS21146D-page 6
Preliminary
© 1996 Microchip Technology Inc.
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