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参数资料
| 型号： | P87C51UBBB |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless low voltage 2.7V.5.5V, low power, high speed 33 MHz |
| 中文描述： | 8-BIT, OTPROM, MICROCONTROLLER, PQFP44 |
| 封装： | 10 X 10 MM, 1.75 MM HEIGHT, PLASTIC, SOT-307-2, QFP-44 |
| 文件页数： | 17/34页 |
| 文件大小： | 394K |
| 代理商： | P87C51UBBB |
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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
相关PDF资料 |
PDF描述 |
|---|---|
| P87C51UFAA | CABLE KNIFE, JOKARI VDECABLE KNIFE, JOKARI VDE; Stripping Capacity:28mm; Weight:0.074kg |
| P87C51UFBB | 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless low voltage 2.7V.5.5V, low power, high speed 33 MHz |
| P87C51UFPN | CABLE/WIRE STRIPPER, JOKARICABLE/WIRE STRIPPER, JOKARI; Stripping Capacity:4mm2; Weight:66g |
| P87C51UBPN | 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless low voltage 2.7V.5.5V, low power, high speed 33 MHz |
| P87C51SFBB | 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless low voltage 2.7V.5.5V, low power, high speed 33 MHz |
相关代理商/技术参数 |
参数描述 |
|---|---|
| P87C51UBBB-S | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| P87C51UBPN | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless low voltage 2.7V.5.5V, low power, high speed 33 MHz |
| P87C51UFAA | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless low voltage 2.7V.5.5V, low power, high speed 33 MHz |
| P87C51UFAA-T | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| P87C51UFBB | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless low voltage 2.7V.5.5V, low power, high speed 33 MHz |
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