AT93C56A_08 Datasheet, PDF (6/21 Pages) ATMEL Corporation – Three-wire Serial EEPROM 2K (256 x 8 or 128 x 16) 4K (512 x 8 or 256 x 16)

Table 3-4.
Instruction
Instruction Set for the AT93C56A and AT93C66A
Address
Op
SB Code
x8
x 16
x8
Data
x 16
READ
1
10
A₈ – A₀
A₇ – A₀
EWEN
ERASE
WRITE
ERAL
1
00
11XXXXXXX 11XXXXXX
1
11
1
01
A₈ – A₀
A₈ – A₀
A₇ – A₀
A₇ – A₀
D₇ – D₀
D₁₅ – D₀
1
00
10XXXXXXX 10XXXXXX
WRAL
1
00
01XXXXXXX 01XXXXXX D₇ – D₀
D₁₅ – D₀
EWDS
1
00
00XXXXXXX 00XXXXXX
Note: The X’s in the address field represent don’t care values and must be clocked.
Comments
Reads data stored in memory, at
specified address.
Write enable must precede all
programming modes.
Erases memory location A_n – A₀.
Writes memory location A_n – A₀.
Erases all memory locations. Valid
only at V_CC = 4.5V to 5.5V.
Writes all memory locations. Valid
only at V_CC = 5.0V ±10% and Disable
Register cleared.
Disables all programming instructions.
6 AT93C56A/66A
3378M–SEEPR–7/08