參數(shù)資料
型號(hào)： DS87C520-WCL
英文描述： EPROM/ROM High-Speed Micro
中文描述： 存儲(chǔ)器/ ROM的高速微
文件頁(yè)數(shù)： 26/45頁(yè)
文件大?。?/td> 1415K
代理商： DS87C520-WCL
DS87C520/DS83C520 EPROM/ROM High-Speed Microcontrollers
26 of 45
Table 9. EPROM Programming Modes
MODE
RST
PSEN
ALE/
PROG
EA
/VPP
P2.6
P2.7
P3.3
P3.6
P3.7
Program Code Data
H
L
PL
12.75V
L
H
H
H
H
Verify Code Data
H
L
H
H
L
L
L
H
H
Program Encryption Array
Address 0-3Fh
H
L
PL
12.75V
L
H
H
L
H
LB1
H
L
PL
12.75V
H
H
H
H
H
LB2
H
L
PL
12.75V
H
H
H
L
L
Program Lock Bits
LB3
H
L
PL
12.75V
H
L
H
H
L
Program Option Register
Address FCh
Read Signature or Option
Registers 30, 31, 60 FCh
H
L
PL
12.75V
L
H
H
L
L
H
L
H
H
L
L
L
L
L
Table 10. DS87C520 EPROM Lock Bits
LOCK BITS
LEVEL
LB1
LB2
LB3
PROTECTION
1
U
U
U
No program lock. Encrypted verify if encryption table was
programmed.
2
P
U
U
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.
3
P
P
U
4
P
P
P
Level 3 plus no external execution.
SECURITY OPTIONS
The DS87C520 employs a standard three-level lock that restricts viewing of the EPROM contents. A 64-
byte Encryption Array allows the authorized user to verify memory by presenting the data in encrypted
form.
Lock Bits
The security lock consists of three lock bits. These bits select a total of four levels of security. Higher
levels provide increasing security but also limit application flexibility. Table 10 shows the security
settings. Note that the programmer cannot directly read the state of the security lock. User software has
access to this information as described in the
Memory
section.
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