CAT93C56LI-G Datasheet, PDF (6/17 Pages) ON Semiconductor – 2-Kb Microwire Serial CMOS EEPROM

CAT93C56, CAT93C57
The format for all instructions sent to the device is a
logical “1” start bit, a 2−bit (or 4−bit) opcode, 7−bit address
(CAT93C57) / 8−bit address (CAT93C56) (an additional bit
when organized X8) and for write operations a 16−bit data
field (8−bit for X8 organizations). The instruction format is
shown in Instruction Set table.
Table 10. INSTRUCTION SET
Instruction
Device Type
Start
Bit Opcode
Address
x8
x16
Data
x8
x16
Comments
READ
93C56 (Note 8)
1
10
93C57
1
10
A8−A0
A7−A0
A7−A0
A6−A0
Read Address
AN–A0
ERASE
93C56 (Note 8)
1
11
93C57
1
11
A8−A0
A7−A0
A7−A0
A6−A0
Clear Address
AN–A0
WRITE
93C56 (Note 8)
1
01
93C57
1
01
A8−A0
A7−A0
A7−A0
A6−A0
D7−D0
D7−D0
D15−D0
D15−D0
Write Address
AN–A0
EWEN
93C56 (Note 8)
1
00
11XXXXXXX 11XXXXXX
Write Enable
93C57
1
00
11XXXXXX
11XXXXX
EWDS
93C56 (Note 8)
1
00
00XXXXXXX 00XXXXXX
Write Disable
93C57
1
00
00XXXXXX
00XXXXX
ERAL
93C56 (Note 8)
1
93C57
1
00
10XXXXXXX 10XXXXXX
00
10XXXXXX
10XXXXX
Clear All
Addresses
WRAL
93C56 (Note 8)
1
93C57
1
00
01XXXXXXX 01XXXXXX D7−D0 D15−D0
Write All
Addresses
00
01XXXXXX
01XXXXX
D7−D0 D15−D0
8. Address bit A8 for 256x8 organization and A7 for 128x16 organization are “Don’t Care” bits, but must be kept at either a “1” or “0” for READ,
WRITE and ERASE commands.
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