參數(shù)資料
型號(hào)： P87C51FA
廠商： NXP Semiconductors N.V.
英文描述： 80C51 8-bit microcontroller family 8K.64K/256.1K OTP/ROM/ROMless, low voltage 2.7V.5.5V, low power, high speed 33 MHz
中文描述： 80C51的8位單片機(jī)系列8K.64K/256.1K檢察官辦公室/光盤/無ROM，2.7V.5.5V低電壓，低功耗，高速33兆赫
文件頁(yè)數(shù)： 17/34頁(yè)
文件大小： 394K
代理商： P87C51FA
2001 Apr 06
17
Philips Semiconductors
Preliminary specification
P87C51MB2/P87C51MC2
80C51 8-bit microcontroller family with extended memory
64KB/96KB OTP with 2KB/3KB RAM
SECURITY BITS
The P87C51Mx2 has security bits to protect users’ firmware codes. With none of the security bits programmed, the code in the
program memory can be verified. With only security bit 1 (see Table 6) 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 EPROM is disabled. When security bits 1 and 2 are programmed, in addition to the above, verify mode is
disabled. When all three security bits are programmed, all of the conditions above apply and all external program memory
execution is disabled.
Security Bits
1,2
Bit 1
U
Protection Description
No program security features enabled. EEPROM is programmable and verifiable.
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.
Same as 2, also verification is disabled.
Same as 3, external execution is disabled.
Bit 2
U
Bit 3
U
1
2
P
U
U
3
4
P
P
P
P
U
P
Notes:
1. P - programmed. U- unprogrammed.
2. Any other combination of security bits is not defined.
Table 6: EPROM Security Bits
相關(guān)PDF資料
PDF描述
P87C51FA-JA 80C51 8-bit microcontroller family 8K.64K/256.1K OTP/ROM/ROMless, low voltage 2.7V.5.5V, low power, high speed 33 MHz
P87C51FA-JB 80C51 8-bit microcontroller family 8K.64K/256.1K OTP/ROM/ROMless, low voltage 2.7V.5.5V, low power, high speed 33 MHz
P87C51FB-JA 80C51 8-bit microcontroller family 8K.64K/256.1K OTP/ROM/ROMless, low voltage 2.7V.5.5V, low power, high speed 33 MHz
P87C51FB-JB 80C51 8-bit microcontroller family 8K.64K/256.1K OTP/ROM/ROMless, low voltage 2.7V.5.5V, low power, high speed 33 MHz
P87C51FB-JN 80C51 8-bit microcontroller family 8K.64K/256.1K OTP/ROM/ROMless, low voltage 2.7V.5.5V, low power, high speed 33 MHz
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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P87C51FA2 制造商:ROCHESTER 制造商全稱:ROCHESTER 功能描述:POWERFUL MICROCONTROLLER from the MCS 51 controller family 44 pin LDCC
P87C51FA-20 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
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