- 您现在的位置：买卖IC网 > PDF目录298876 > BN87C51FC20 (INTEL CORP) 8-BIT, OTPROM, 20 MHz, MICROCONTROLLER, PQCC44 PDF资料下载
参数资料
| 型号： | BN87C51FC20 |
| 厂商： | INTEL CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 20 MHz, MICROCONTROLLER, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 8/18页 |
| 文件大小： | 1527K |
| 代理商： | BN87C51FC20 |
AUTOMOTIVE 87C51FA/FB/FC/FC-20
EPROM Program Lock
The 87C51FA/FB/FC program lock system, when
programmed, protects the onboard program against
software piracy.
The 87C51FA/FB/FC has a 3-level program lock
system and a 64-byte encryption array. Since this is
an EPROM device, all locations are user program-
mable. See Table 4.
Program Lock Bits
The 87C51FA/FB/FC has 3 programmable lock bits
that when programmed according to Table 4 will
provide different levels of protection for the on-chip
code and data.
Erasing the EPROM also erases the encryption ar-
ray and the program lock bits, returning the part to
full functionality.
Encryption Array
Within the EPROM array are 64 bytes of Encryption
Array that are initially unprogrammed (all 1's). Every
time that a byte is addressed during a verify, 6 ad-
dress lines are used to select a byte of the Encryp-
tion Array. This byte is then exclusive-NOR'ed
(XNOR) with the code byte, creating an Encryption
Verify byte. The algorithm, with the array in the un-
programmed state (all 1's), will return the code in it's
original, unmodified form. For programming the En-
cryption Array, refer to Table 3 (EPROM Program-
ming Mode).
Reading the Signature Bytes
The 87C51FA/FB/FC has 3 signature bytes in loca-
tions 30H, 31H and 60H. To read these bytes follow
the procedure for EPROM verify, but activate the
control lines provided in Table 3 for Read Signature
Byte.
Location: 30H e 89H
31H e 58H
60H e FBH (for an FB part)
60H e FCH (for an FC part)
Table 4. Program Lock Bits and the Features
Program Lock Bits
Protection Type
LB1
LB2
LB3
1
U
No Program Lock features enabled. (Code verify will still be encrypted by the
Encryption Array if programmed.)
2
P
U
MOVC instructions executed from external program memory are disabled
from fetching code bytes from internal memory, EA is sampled and latched on
Reset, and further programming of the EPROM is disabled.
3
P
U
Same as 2, also verify is disabled.
4
P
Same as 3, also external execution is disabled.
Any other combination of the lock bits is not defined.
16
相关PDF资料 |
PDF描述 |
|---|---|
| BP87C51FB | 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PDIP40 |
| BN87C51FB | 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PQCC44 |
| BN87C51FC-20 | 8-BIT, OTPROM, 20 MHz, MICROCONTROLLER, PQCC44 |
| BNC5-J-C-H-ST-BH1 | PANEL MOUNT, CABLE TERMINATED, FEMALE, BNC CONNECTOR, CRIMP, JACK |
| BNC7-J-C-H-ST-BH3 | PANEL MOUNT, CABLE TERMINATED, FEMALE, BNC CONNECTOR, CRIMP, JACK |
相关代理商/技术参数 |
参数描述 |
|---|---|
| BN87C51FC-20 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| BN87C54 | 制造商:INTEL 制造商全称:Intel Corporation 功能描述:CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER WITH 16 KBYTES USER PROGRAMMABLE EPROM |
| BN87C54-20 | 制造商:INTEL 制造商全称:Intel Corporation 功能描述:CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER WITH 16 KBYTES USER PROGRAMMABLE EPROM |
| BN8FLB02500618P | 制造商:HEX HEAD CAP SCREWS 功能描述: |
| BN8FLB03001216P | 制造商:HEX HEAD CAP SCREWS 功能描述: |
发布紧急采购，3分钟左右您将得到回复。