M93S46 ST Microelectronics, M93S46 Datasheet - Page 5

• Manufacturer Part Number: M93S46
• Description: 4Kbit / 2Kbit and 1Kbit 16-bit wide MICROWIRE Serial Access EEPROM with Block Protection
• Manufacturer: ST Microelectronics

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