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參數(shù)資料
| 型號： | P8242AH |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | UNIVERSAL PERIPHERAL INTERFACE 8-BIT SLAVE MICROCONTROLLER |
| 中文描述： | 8-BIT, MROM, 12.5 MHz, MICROCONTROLLER, PDIP40 |
| 封裝： | PLASTIC, DIP-40 |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 243K |
| 代理商： | P8242AH |
UPI-41AH/42AH
The entire sequence of program pulses and byte
verifications is performed at V
CC
e
6.0V and V
DD
e
12.5V. When the inteligent Programming cycle has
been completed, all bytes should be compared to
the original data with V
CC
e
5.0, V
DD
e
5V.
Verify
A verify should be performed on the programmed
bits to determine that they have been correctly pro-
grammed. The verify is performed with T0
e
5V,
V
DD
e
5V, EA
e
12.5V, SS
e
5V, PROG
e
5V,
A0
e
0V, and CS
e
5V.
SECURITY BIT
The security bit is a single EPROM cell outside the
EPROM array. The user can program this bit with the
appropriate access code and the normal program-
ming procedure, to inhibit any external access to the
EPROM contents. Thus the user’s resident program
is protected. There is no direct external access to
this bit. However, the security byte in the signature
row has the same address and can be used to
check indirectly whether the security bit has been
programmed or not. The security bit has no effect on
the signature mode, so the security byte can always
be examined.
SECURITY BIT PROGRAMMING/
VERIFICATION
Programming
a. Read the security byte of the signature mode.
Make sure it is 00H.
b. Apply access code to appropriate inputs to put
the device into security mode.
c. Apply high voltage to EA and V
DD
pins.
d. Follow the programming procedure as per the
inteligent Programming Algorithm with known
data on the databus. Not only the security bit, but
also the security byte of the signature row is pro-
grammed.
e. Verify that the security byte of the signature
mode contains the same data as appeared on
the data bus. (If DB0–DB7
e
high, the security
byte will contain FFH.)
f. Read two consecutive known bytes from the
EPROM array and verify that the wrong data are
retrieved in at least one verification. If the
EPROM can still be read, the security bit may
have not been fully programmed though the se-
curity byte in the signature mode has.
Verification
Since the security bit address overlaps the address
of the security byte of the signature mode, it can be
used to check indirectly whether the security bit has
been programmed or not. Therefore, the security bit
verification is a mere read operation of the security
byte of the signature row (0FFH
e
security bit pro-
grammed; 00H
e
security bit unprogrammed). Note
that during the security bit programming, the reading
of the security byte does not necessarily indicate
that the security bit has been successfully pro-
grammed. Thus, it is recommended that two consec-
utive known bytes in the EPROM array be read and
the wrong data should be read at least once, be-
cause it is highly improbable that random data coin-
cides with the correct ones twice.
8
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