AT87C54X2-3CSUL View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
AT87C54X2-3CSUL Datasheet PDF : 62 Pages
| |||
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
placed in specific set-up modes (See Figure 17-1.).
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
ALE/PR
PSEN
OG EA/VPP P2.6
P2.7
P3.3
P3.6
P3.7
1
0
Program Code data
12.75V
0
1
1
1
1
1
0
1
1
0
Verify Code data
0
1
1
Program Encryption
1
0
Array Address 0-3Fh
12.75V
0
1
1
0
1
1
0
1
1
0
Read Signature Bytes
0
0
0
1
0
Program Lock bit 1
12.75V 1
1
1
1
1
1
0
Program Lock bit 2
12.75V 1
1
1
0
0
1
0
Program Lock bit 3
12.75V 1
0
1
1
0
38 AT/TS8xC54/8X2
4431E–8051–04/06
Share Link: 