UPI-41AH Datasheet, PDF (9/20 Pages) Intel Corporation – UNIVERSAL PERIPHERAL INTERFACE 8-BIT SLAVE MICROCONTROLLER

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 checksum 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 This 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 The 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 This 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 This 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
Test Code Checksum
Intel Signature
User Signature
Test Signature
Security Byte
Address
0
0FH
16H
1EH
10H
11H
12H
13H
14H
15H
1FH
Device
Type
ROM OTP
ROM OTP
OTP
ROM OTP
OTP
No of
Bytes
25
2
2
2
1
9