
38
4431E–8051–04/06
AT/TS8xC54/8X2
17.2.3
Signature bytes
The TS87C54/58X2 contains 4 factory programmed signatures bytes. To read these bytes, per-
form the process described in section 8.3.
17.3
EPROM Programming
17.3.1
Set-up modes
In order to program and verify the EPROM or to read the signature bytes, the TS87C54/58X2 is
Control and program signals must be held at the levels indicated in
Table 17-2.17.3.2
Definition of terms
Address Lines:P1.0-P1.7,
P2.0-P2.5,
P3.4
respectively
for
A0-A14
(P2.5
(A13)
for
TS87C54X2, P3.4 (A14) for TS87C58X2).
Data Lines:P0.0-P0.7 for D0-D7
Control Signals:RST, PSEN, P2.6, P2.7, P3.3, P3.6, P3.7.
Program Signals:ALE/PROG, EA/VPP.
Table 17-2.
EPROM Set-Up Modes
Mode
RST
PSEN
ALE/PR
OG
EA/VPP
P2.6
P2.7
P3.3
P3.6
P3.7
Program Code data
1
0
12.75V
01111
Verify Code data
1
0
110
011
Program Encryption
Array Address 0-3Fh
1
0
12.75V
0
1
0
1
Read Signature Bytes
1
0
1
0
Program Lock bit 1
1
0
12.75V
1
Program Lock bit 2
1
0
12.75V
1
0
Program Lock bit 3
1
0
12.75V
1
0
1
0