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參數(shù)資料
| 型號： | 8XC51FA |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 8-bit CMOS (low voltage, low power and high speed) microcontroller families |
| 中文描述： | 8位CMOS（低電壓，低功耗和高速）微控制器系列 |
| 文件頁數(shù)： | 48/55頁 |
| 文件大?。?/td> | 361K |
| 代理商： | 8XC51FA |
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Philips Semiconductors
Preliminary specification
8XC52/54/58/80C32
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
8-bit CMOS (low voltage, low power
and high speed) microcontroller families
1997 Dec 01
222
MASK ROM DEVICES
Security Bits
With none of the security bits programmed the code in the program
memory can be verified. If the encryption table is programmed, the
code will be encrypted when verified. When only security bit 1 (see
Table 10) is programmed, MOVC instructions executed from
external program memory are disabled from fetching code bytes
from the internal memory, EA is latched on Reset and all further
programming of the EPROM is disabled. When security bits 1 and 2
are programmed, in addition to the above, verify mode is disabled.
Encryption Array
64 bytes of encryption array are initially unprogrammed (all 1s).
Table 11. Program Security Bits
PROGRAM LOCK BITS
1, 2
SB1
SB2
PROTECTION DESCRIPTION
1
U
U
No Program Security 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.
NOTES:
1. P – programmed. U – unprogrammed.
2. Any other combination of the security bits is not defined.
ROM CODE SUBMISSION FOR 8K ROM DEVICES (80C52, 83C51FA, AND 83C51RA+)
When submitting ROM code for the 8k ROM devices, the following must be specified:
1. 8k byte user ROM data
2. 64 byte ROM encryption key
3. ROM security bits.
ADDRESS
CONTENT
BIT(S)
COMMENT
0000H to 1FFFH
DATA
7:0
User ROM Data
2000H to 203FH
KEY
7:0
ROM Encryption Key
FFH = no encryption
2040H
SEC
0
ROM Security Bit 1
0 = enable security
1 = disable security
2040H
SEC
1
ROM Security Bit 2
0 = enable security
1 = disable security
Security Bit 1:
1. External MOVC is disabled, and
2. EA is latched on Reset.
When programmed, this bit has two effects on masked ROM parts:
Security Bit 2:
When programmed, this bit inhibits Verify User ROM.
NOTE:
Security Bit 2 cannot be enabled unless Security Bit 1 is enabled.
If the ROM Code file does not include the options, the following information must be included with the ROM code.
For each of the following, check the appropriate box, and send to Philips along with the code:
Security Bit #1:
Enabled
Disabled
Security Bit #2:
Enabled
Disabled
Encryption:
No
Yes
If Yes, must send key file.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 8XC51FC | 8-bit CMOS (low voltage, low power and high speed) microcontroller families |
| 8XC51RD | 8-bit CMOS (low voltage, low power and high speed) microcontroller families |
| 8XC80C32 | 8-bit CMOS (low voltage, low power and high speed) microcontroller families |
| 8XC51FB | Low power single card reader |
| 8XC51 | CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 8XC51FA/FB/FC/80C51FA | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:(360.35 k) |
| 8XC51FB | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low power single card reader |
| 8XC51FC | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit CMOS (low voltage, low power and high speed) microcontroller families |
| 8XC51FX | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS |
| 8XC51GB | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER |
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