参数资料
型号: S-93C66AFJ-TBP
元件分类: PROM
英文描述: 256 X 16 MICROWIRE BUS SERIAL EEPROM, PDSO8
封装: SOP-8
文件页数: 4/30页
文件大小: 419K
代理商: S-93C66AFJ-TBP
CMOS SERIAL E2PROM
S-93C46A/56A/66A
Rev. 2.3_00
Seiko Instruments Inc.
12
3.
Write enable (EWEN) and Write disable (EWDS)
The EWEN instruction puts the S-93C46A/56A/66A into write enable mode, which accepts WRITE, ERASE, WRAL, 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, after power-on and before shut-down.
Figure 19 EWEN/EWDS Timing (S-93C46A)
4Xs
11=EWEN
00=EWDS
0
8
7
6
5
4
3
2
1
SK
DI
1
0
9
STANDBY
CS
Figure 20 EWEN/EWDS Timing (S-93C56A)
6Xs
11=EWEN
00=EWDS
0
8
7
6
5
4
3
2
1
SK
DI
1
0
11
9
STANDBY
CS
10
Figure 21 EWEN/EWDS Timing (S-93C66A)
6Xs
11=EWEN
00=EWDS
0
8
7
6
5
4
3
2
1
SK
DI
1
0
11
9
STANDBY
CS
10
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