s-93c46a Seiko Instruments Inc., s-93c46a Datasheet - Page 13

• Manufacturer Part Number: s-93c46a
• Description: Cmos Serial E2prom
• Manufacturer: Seiko Instruments Inc.

CMOS SERIAL E
S-93C46A/56A/66A
3.
and ERAL instructions. The EWDS instruction puts the S-93C46A/56A/66A into write disable mode, which refuses WRITE,
ERASE, WRAL, and ERAL instructions.
The S-93C46A/56A/66A powers on in write disable mode, which protects data against unexpected, erroneous write
operations caused by noise and/or CPU malfunctions. It should be kept in write disable mode except when performing write
operations.
12
The EWEN instruction puts the S-93C46A/56A/66A into write enable mode, which accepts WRITE, ERASE, WRAL,
Write enable (EWEN) and Write disable (EWDS)
SK
SK
2
CS
DI
CS
DI
SK
CS
DI
PROM
1
1
1
1
1
1
Figure 19
Figure 20
Figure 21
0
0
0
2
2
2
0
0
0
3
3
Seiko Instruments Inc.
3
11=EWEN
00=EWDS
11=EWEN
00=EWDS
11=EWEN
00=EWDS
EWEN/EWDS Timing (S-93C46A)
EWEN/EWDS Timing (S-93C56A)
EWEN/EWDS Timing (S-93C66A)
4
4
4
5
5
5
6
6
6
7
7
7
4Xs
6Xs
6Xs
8
8
8
9
9
9
10
10
STANDBY
11
11
STANDBY
STANDBY