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ST93CS56 データシート(PDF) 10 Page - STMicroelectronics

部品番号 ST93CS56
部品情報  2K 128 x 16 SERIAL MICROWIRE EEPROM
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
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Accessing the Protect Register is done by execut-
ing the following sequence:
– WEN: execute the Write Enable instruction,
– PREN: execute the PREN instruction,
– PRWRITE, PRCLEAR or PRDS: the protection
then may be defined, in terms of size of the
protected area (PRWRITE, PRCLEAR) and
may be set permanently (PRDS instruction).
Protect Register Read
The Protect Register Read instruction (PRREAD)
outputs on the Data Output Q the content of the
Protect Register, followed by the Protect Flag bit.
The Protect Register Enable pin (PRE) must be
driven High before and during the instruction. As in
the Read instruction a dummy ’0’ bit is output first.
Since it is not possible to distinguish if the Protect
Register is cleared (all 1’s) or if it is written with all
1’s, user must check the Protect Flag status (and
not the Protect Register content) to ascertain the
setting of the memory protection.
Protect Register Enable
The Protect Register Enable instruction (PREN) is
used to authorize the use of further PRCLEAR,
PRWRITE and PRDS instructions. The PREN
insruction does not modify the Protect Flag bit
value.
Note: A Write Enable (WEN) instruction must be
executed before the Protect Enable instruction.
Both the Protect Enable (PRE) and Write Enable
(W) input pins must be held High during the instruc-
tion execution.
Protect Register Clear
The Protect Register Clear instruction (PRCLEAR)
clears the address stored in the Protect Register to
all 1’s, and thus enables the execution of WRITE
and WRALL instructions. The Protect Register
Clear execution clears the Protect Flag to ’1’. Both
the Protect Enable (PRE) and Write Enable (W)
input pins must be driven High during the instruc-
tion execution.
Note: A PREN instruction must immediately pre-
cede the PRCLEAR instruction.
Protect Register Write
The Protect Register Write instruction (PRWRITE)
is used to write into the Protect Register the ad-
dress of the first word to be protected. After the
PRWRITE instruction execution, all memory loca-
tions equal to and above the specified address, are
protected from writing. The Protect Flag bit is set to
’0’, it can be read with Protect Register Read
instruction. Both the Protect Enable (PRE) and
Write Enable (W) input pins must be driven High
during the instruction execution.
Note: A PREN instruction must immediately pre-
cede the PRWRITE instruction, but it is not neces-
sary to execute first a PRCLEAR.
Protect Register Disable
The Protect Register Disable instruction sets the
One Time Programmable bit (OTP bit). The Protect
Register Disable instruction (PRDS) is a ONE TIME
ONLY instruction which latches the Protect Regis-
ter content, this content is therefore unalterable in
the future. Both the Protect Enable(PRE) and Write
Enable (W) input pins must be driven High during
the instruction execution. The OTP bit cannot be
directly read, it can be checked by reading the
content of the Protect Register (PRREAD instruc-
tion), then by writing this same value into the Pro-
tect Register (PRWRITE instruction): when the
OTP bit is set, the Ready/Busy status cannot ap-
pear on the Data output (Q); when the OTP bit is
not set, the Busy status appear on the Data output
(Q).
A PREN instruction must immediately precede the
PRDS instruction.
READY/BUSY Status
When the ST93CS56/57 is performing the write
cycle, the Busy signal (Q = 0) is returned if S is
driven high, and the ST93CS56/57 will ignore any
data on the bus. When the write cycle is completed,
the Ready signal (Q = 1) will indicate, if S is driven
high, that the ST93CS56/57 is ready to receive a
new instruction. Once the ST93CS56/57 is Ready,
the Data Output Q is set to ’1’ until a new Start bit
is decoded or the Chip Select is brought Low.
COMMON I/O OPERATION
The Data Output (Q) and Data Input (D) signals can
be connected together, through a current limiting
resistor, to form a common, one wire data bus.
Some precautions must be taken when operating
the memory with this connection, mostly to prevent
a short circuit between the last entered address bit
(A0) and the first data bit output by Q. The reader
should refer to the SGS-THOMSON application
note ”MICROWIRE EEPROM Common I/O Opera-
tion”.
MEMORY WRITE PROTECTION (cont’d)
10/16
ST93CS56, ST93CS57


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