DS87C530 Maxim, DS87C530 Datasheet - Page 30

• Manufacturer Part Number: DS87C530
• Description: The DS87C530/DS83C530 EPROM/ROM microcontrollers with a real-time clock (RTC) are 8051-compatible microcontrollers based on the Dallas Semiconductor high-speed core
• Manufacturer: Maxim

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
DS87C530/DS83C530 EPROM/ROM Microcontrollers with Real-Time Clock
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 45
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