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M9346-BN3T Datasheet(PDF) 7 Page - STMicroelectronics

Part No. M9346-BN3T
Description  4Kbit, 2Kbit and 1Kbit 16-bit wide MICROWIRE Serial Access EEPROM with Block Protection
Download  34 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M9346-BN3T Datasheet(HTML) 7 Page - STMicroelectronics

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M93S66, M93S56, M93S46
Table 3. Instruction Set for the M93S66, M93S56
Note: 1. X = Don’t Care bit.
2. Address bit A7 is not decoded by the M93S56.
Instruction
Description
W
PRE
Start
bit
Op-
Code
Address1,2
Data
Required
Clock
Cycles
Additional
Comments
READ
Read Data
from Memory
X
0
1
10
A7-A0
Q15-Q0
WRITE
Write Data to
Memory
1
0
1
01
A7-A0
D15-D0
27
Write is executed if
the address is not
inside the
Protected area
PAWRITE
Page Write to
Memory
10
1
11
A7-A0
N x
D15-D0
11 + N x 16
Write is executed if
all the N
addresses are not
inside the
Protected area
WRAL
Write All
Memory
with same
Data
1
0
1
00
01XXXXXX
D15-D0
27
Write all data if the
Protection
Register is cleared
WEN
Write Enable
1
0
1
00
11XXXXXX
11
WDS
Write Disable
X
0
1
00
00XXXXXX
11
PRREAD
Protection
Register Read
X
1
1
10
XXXXXXXX
Q7-Q0
+ Flag
Data Output =
Protection
Register content +
Protection Flag bit
PRWRITE
Protection
Register Write
11
1
01
A7-A0
11
Data above
specified address
A7-A0 are
protected
PRCLEAR
Protection
Register Clear
1
1
1
11
11111111
11
Protect Flag is also
cleared (cleared
Flag = 1)
PREN
Protection
Register
Enable
1
1
1
00
11XXXXXX
11
PRDS
Protection
Register
Disable
1
1
1
00
00000000
11
OTP bit is set
permanently


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