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ST93CS67 Scheda tecnica(PDF) 6 Page - STMicroelectronics

Il numero della parte ST93CS67
Spiegazioni elettronici  4K 256 x 16 SERIAL MICROWIRE EEPROM
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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POWER-ON DATA PROTECTION
In order to prevent data corruption and inadvertent
write operations during power up, a Power On
Reset (POR) circuit resets all internal programming
circuitry and sets the device in the Write Disable
mode. When VCC reaches its functional value, the
device is properlyreset (in the Write Disable mode)
and is ready to decode and execute an incoming
instruction. A stable VCC must be applied before
any logic signal.
INSTRUCTIONS
The ST93CS66/67 has eleven instructions, as
shown in Table 6. Each instruction is composed of
a 2 bit op-code and an 8 bit address. Each instruc-
tion is preceded by the rising edge of the signal
applied on the Chip Select (S) input (assuming that
the Clock C is low). The data input D is then
sampled upon the following rising edges of the
clock C until a ’1’ is sampled and decoded by the
ST93CS66/67 as a Start bit.
The ST93CS66/67 is fabricated in CMOS technol-
ogy and is therefore able to run from zero Hz (static
input signals) up to the maximum ratings (specified
in Table 5).
Read
The Read instruction (READ) outputs serial data
on the Data Output (Q). When a READ instruction
is received, the instruction and address are de-
coded and the data from the memory is transferred
into an output shiftregister. A dummy ’0’ bit is output
first followed by the 16 bit word with the MSB first.
Instruction
Description
W
pin
(1)
PRE
pin
Op
Code
Address
(1)
Data
Additional
Information
READ
Read Data from Memory
X
’0’
10
A7-A0
Q15-Q0
WRITE
Write Data to Memory
’1’
’0’
01
A7-A0
D15-D0
Write is executed if
the address is not
inside the
Protected area
PAWRITE
Page Write to Memory
’1’
’0’
11
A7-A0
D15-D0
Write is executed if
all the addresses
are not inside the
Protected area
WRALL
Write All Memory
’1’
’0’
00
01XX XXXX
D15-D0
Write all data if the
Protect Register is
cleared
WEN
Write Enable
’1’
’0’
00
11XX XXXX
WDS
Write Disable
X
’0’
00
00XX XXXX
PRREAD
Protect Register Read
X
’1’
10
XXXX XXXX
Q8-Q0
Data Output =
Protect Register
content + Protect
Flag bit
PRWRITE
Protect Register Write
’1’
’1’
01
A7-A0
Data above
specified address
A7-A0 are
protected
PRCLEAR
Protect Register Clear
’1’
’1’
11
1111 1111
Protect Flag is also
cleared (cleared
Flag = 1)
PREN
Protect Register Enable
’1’
’1’
00
11XX XXXX
PRDS
Protect Register Disable
’1’
’1’
00
0000 0000
OTP bit is set
permanently
Note: 1. X = don’t care bit.
Table 6. Instruction Set
6/16
ST93CS66, ST93CS67


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