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M93S46-W Datasheet(PDF) 10 Page - STMicroelectronics

No. de pieza M93S46-W
Descripción Electrónicos  4 Kbit, 2 Kbit and 1 Kbit serial MICROWIRE bus EEPROM with write protection
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M93S46-W Datasheet(HTML) 10 Page - STMicroelectronics

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Instructions
M93S46-W M93S56-W M93S66-W
10/32
DocID5124 Rev 7
5
Instructions
The instruction set of the M93Sx6 devices contains seven instructions, as summarized in
Table 2: "Instruction set for the M93S46" and Table 3: "Instruction set for the M93S66,
M93S56". Each instruction consists of the following parts, as shown in Figure 4: "READ
sequence", Figure 5: "WRITE sequence" and Figure 6: "WEN and WDS sequences":
Each instruction is preceded by a rising edge on Chip Select Input (S) with Serial
Clock (C) being held Low.
A start bit, which is the first '1' read on Serial Data Input (D) during the rising edge of
Serial Clock (C).
Two op-code bits, read on Serial Data Input (D) during the rising edge of Serial Clock
(C). (Some instructions also use the first two bits of the address to define the
op-code).
The address bits of the byte or word that is to be accessed. For the M93S46, the
address is made up of 6 bits (see Table 2: "Instruction set for the M93S46"). For the
M93S56 and M93S66, the address is made up of 8 bits (see Table 3: "Instruction set
for the M93S66, M93S56").
The M93Sx6 devices are fabricated in CMOS technology and are therefore able to run as
slow as 0 Hz (static input signals) or as fast as the maximum ratings specified in Table 11:
"AC Characteristics (M93Sx6-W, device grade 6)".
Table 2: Instruction set for the M93S46
Instruction
Description
W
PRE
Start
bit
Op-
code
Address
(1)
Data
Required
clock
cycles
Additional
comments
READ
Read Data
from Memory
X
0
1
10
A5-A0
Q15-Q0
-
-
WRITE
Write Data to
Memory
1
0
1
01
A5-A0
D15-D0
25
Write is executed
if the address is
not inside the
Protected area
PAWRITE
Page Write to
Memory
1
0
1
11
A5-A0
N x
D15-D0
9 + 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
01 XXXX
D15-D0
25
Write all data if
the Protection
Register is
cleared
WEN
Write Enable
1
0
1
00
11 XXXX
-
9
-
WDS
Write Disable
X
0
1
00
00 XXXX
-
9
-
PRREAD
Protection
Register Read
X
1
1
10
XXXXXX
Q5-Q0
+ Flag
-
Data Output =
Protection
Register content +
Protection Flag bit
PRWRITE
Protection
Register Write
1
1
1
01
A5-A0
-
9
Data above
specified address
A5-A0 are
protected


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