DS87C530-ENL+ DALLAS [Dallas Semiconductor], DS87C530-ENL+ Datasheet - Page 30

• Manufacturer Part Number: DS87C530-ENL+
• Description: EPROM/ROM Microcontrollers with Real-Time Clock
• Manufacturer: DALLAS [Dallas Semiconductor]

Table 9. EPROM Programming Modes
*
Table 10. EPROM Lock Bits
Program Code Data
Verify Code Data
Program Encryption
Array Address 0-3Fh
Program Lock
Bits
Program Option
Register Address FCh
Read Signature or
Option Registers 30,
31, 60, FCh
LEVEL
PL indicates pulse to a logic low.
1
2
3
4
MODE
LB1
U
P
P
P
LB1
LB2
LB3
LOCK BITS
LB2
U
U
P
P
RST
H
H
H
H
H
H
H
H
LB3
U
U
U
P
PSEN
L
L
L
L
L
L
L
L
No program lock. Encrypted verify if encryption table was
programmed.
Prevent MOVC instructions in external memory from reading
program bytes in internal memory. EA is sampled and latched on
reset. Allow no further programming of EPROM.
Level 2 plus no verify operation. Also, prevent MOVX instructions in
external memory from reading SRAM (MOVX) in internal memory.
Level 3 plus no external execution.
ALE/PROG
PL
PL
PL
PL
PL
PL
H
H
30 of 47
EA/VPP
12.75V
12.75V
12.75V
12.75V
12.75V
12.75V
H
H
PROTECTION
P2.6
H
H
H
L
L
L
L
L
P2.7
H
H
H
H
H
L
L
L
P3.3
H
H
H
H
H
H
L
L
P3.6
H
H
H
H
L
L
L
L
P3.7
H
H
H
H
L
L
L
L