Unlock Microcontroller AT89C51RE2 Locked Memory
Unlock Microcontroller AT89C51RE2 Locked Memory
unlock microcontroller AT89C51RE2 locked memory needs to know its features, please check below contents:
AT89C51RE2 is a high performance CMOS Flash version of the 80C51 CMOS single chip 8-bit microcontroller. It contains a 128 Kbytes Flash memory block for program. The 128 Kbytes Flash memory can be programmed either in parallel mode or in serial mode with the ISP capability or with software. The programming voltage is internally generated from the standard VCC pin.
The AT89C51RE2 retains all features of the Atmel 80C52 with 256 bytes of internal RAM, a 10 source 4-level interrupt controller and three timer/counters. In addition, the AT89C51RE2 has a Programmable Counter Array, an XRAM of 8192 bytes, a Hardware Watchdog Timer, SPI and Keyboard, two serial channels that facilitates multiprocessor communication (EUART), a speed improvement mechanism (X2 mode) and an extended stack mode that allows the stack to be extended in the lower 256 bytes of XRAM.
The fully static design of the AT89C51RE2 allows to reduce system power consumption by bringing the clock frequency down to any value, even DC, without loss of data. The AT89C51RE2 has 2 software-selectable modes of reduced activity and 8-bit clock prescaler for further reduction in power consumption. In the Idle mode the CPU is frozen while the peripherals and the interrupt system are still operating. In the power-down mode the RAM is saved and all other functions are inoperative.
The added features of the AT89C51RE2 make it more powerful for applications that need pulse width modulation, high speed I/O and counting capabilities such as alarms, motor control, corded phones, smart card unlockers. The Flash memory increases EPROM and ROM functionality with in-circuit electrical erasure and programming. It contains 128K bytes of program memory organized in 1024 pages of 128 bytes.
Unlock Microcontroller AT89C51RE2 Locked Memory
This memory is both parallel and serial In-System Programmable (ISP). ISP allows devices to alter their own program memory in the actual end product under software control. A default serial loader (bootloader) program allows ISP of the Flash. The programming does not require external high programming voltage. The necessary high programming voltage is generated on-chip using the standard VCC pins of the microcontroller.
Flash internal program memory. Boot vector allows user provided Flash loader code to reside anywhere in the Flash memory space. This configuration provides flexibility to the user. Default loader in Boot Flash allows programming via the serial port without the need of a user provided loader. Up to 64K byte external program memory if the internal program memory is disabled (EA = 0).
Programming and erase voltage with standard 5V or 3V VCC supply. The AT89C51RE2 implements up to 128K bytes of on-chip program/code memory. Figure 9 and Figure 10 shows the partitioning of internal and external program/code memory spaces according to EA value before unlock microcontroller AT89C51RE2 locked memory.