Unlock Chip AT87F51RC Code

We can Unlock Chip AT87F51RC Code, please view the Chip AT87F51RC features for your reference:

Compatible with MCS-51™ Products

32K Bytes of One-time Programmable QuickFlash™ Memory

4V to 6V Operating Range

Fully Static Operation: 0 Hz to 24 MHz

Three-level Program Memory Lock

512 x 8-bit Internal RAM when Unlock Chip

32 Programmable I/O Lines

Three 16-bit Timer/Counters

Eight Interrupt Source



Programmable Serial Channel

Low-power Idle and Power-down Modes if Unlock Chip

Interrupt Recovery from Power-down

Hardware Watchdog Timer

Dual Data Pointer

Power-off Flag

The AT87F51RC is a low-power, high-performance CMOS 8-bit microcomputer with 32K bytes of QuickFlash one-time programmable (OTP) read only memory and 512 bytes of RAM. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard 80C51 and 80C52 instruction set and pinout before Unlock Chip.

The on-chip QuickFlash allows the program memory to be user programmed by a conventional nonvolatile memory programmer. A total of 512 bytes of internal RAM are available in the AT87F51RC. The 256-byte expanded internal RAM is accessed via MOVX instructions after clearing bit 1 in the SFR located at address 8EH. The other 256-byte RAM segment is accessed the same way as the Atmel AT89-series and other 8052-compatible products after Unlock Chip.

By combining a versatile 8-bit CPU with QuickFlash on a monolithic chip, the Atmel AT87F51RC is a powerful microcomputer which provides a highly-flexible and cost effective solution to many embedded control applications. The AT87F51RC provides the following standard features when Unlock Chip:

32K bytes of QuickFlash, 512 bytes of RAM, 32 I/O lines, three 16-bit timer/counters, a six-vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In addition, the AT87F51RC is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes if Unlock Chip.

The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue functioning. The Power-down mode saves the RAM contents but freezes the oscillator, disabling all other chip functions until the next external interrupt or hardware reset before Unlock Chip.


Supply voltage.



Port 0

Port 0 is an 8-bit open drain bidirectional I/O port. As an output port, each pin can sink eight TTL inputs. When 1s are written to port 0 pins, the pins can be used as high impedance inputs. Port 0 can also be configured to be the multiplexed low order address/data bus during accesses to external program and data memory. In this mode, P0 has internal pullups after Unlock Chip.

Port 0 also receives the code bytes during QuickFlash programming and outputs the code bytes during program verification. External pullups are required during program verification.

Tags: ,,,,,,,,