参数资料
型号: DS87C520-ENL+
厂商: Maxim Integrated Products
文件页数: 19/43页
文件大小: 0K
描述: IC MCU EPROM/ROM 33MH IND 44TQFP
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 160
系列: 87C
核心处理器: 8051
芯体尺寸: 8-位
速度: 33MHz
连通性: EBI/EMI,SIO,UART/USART
外围设备: 电源故障复位,WDT
输入/输出数: 32
程序存储器容量: 16KB(16K x 8)
程序存储器类型: OTP
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-TQFP
包装: 托盘
产品目录页面: 703 (CN2011-ZH PDF)
DS87C520/DS83C520 EPROM/ROM High-Speed Microcontrollers
26 of 43
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
Verify Code Data
H
L
H
L
H
Program Encryption Array
Address 0-3Fh
H
L
PL
12.75V
L
H
L
H
LB1
H
L
PL
12.75V
H
LB2
H
L
PL
12.75V
H
L
Program Lock Bits
LB3
H
L
PL
12.75V
H
L
H
L
Program Option Register
Address FCh
H
L
PL
12.75V
L
H
L
Read Signature or Option
Registers 30, 31, 60 FCh
H
L
H
L
Table 10. DS87C520 EPROM Lock Bits
LOCK BITS
LEVEL
LB1
LB2
LB3
PROTECTION
1
U
No program lock. Encrypted verify if encryption table was
programmed.
2
P
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.
3
P
U
Level 2 plus no verify operation. Also, prevent MOVX
instructions in external memory from reading SRAM (MOVX) in
internal memory.
4
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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