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參數(shù)資料
| 型號(hào)： | 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)： | 9/20頁 |
| 文件大?。?/td> | 243K |
| 代理商： | P8242AH |
UPI-41AH/42AH
SIGNATURE MODE
The UPI-41AH/42AH has an additional 32 bytes of
EPROM available for Intel and user signatures and
miscellaneous purposes. The 32 bytes are parti-
tioned as follows:
A.
Test code/checksumD
This can accommodate
up to 25 bytes of code for testing the internal
nodes that are not testable by executing from the
external memory. The test code/checksum is
present on ROMs, and OTPs.
B.
Intel signature
DThis allows the programmer to
read from the UPI-41AH/42AH the manufacturer
of the device and the exact product name. It fa-
cilitates automatic device identification and will
be present in the ROM and OTP versions. Loca-
tion 10H contains the manufacturer code. For In-
tel, it is 89H. Location 11H contains the device
code.
The code is 43H and 42H for the 8042AH and
OTP 8742AH, and 41H and 40H for the 8041AH
and OTP 8741AH, respectively. The code is 44H
for any device with the security bit set by Intel.
C.
User signature
DThe user signature memory is
implemented in the EPROM and consists of 2
bytes for the customer to program his own signa-
ture code (for identification purposes and quick
sorting of previously programmed materials).
D.
Test signature
DThis memory is used to store
testing information such as: test data, bin num-
ber, etc. (for use in quality and manufacturing
control).
E.
Security byte
DThis byte is used to check
whether the security bit has been programmed
(see the security bit section).
The signature mode can be accessed by setting P10
e
0, P11–P17
e
1, and then following the programming
and/or verification procedures. The location of the various address partitions are as follows:
Address
Device
Type
No. of
Bytes
Test Code/Checksum
0
0FH
1EH
ROM/OTP
25
16H
Intel Signature
10H
11H
ROM/OTP
2
User Signature
12H
13H
OTP
2
Test Signature
14H
15H
ROM/OTP
2
Security Byte
1FH
OTP
1
9
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