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Many variants of the 8051 include the standard 256 bytes of IRAM plus a few kilobytes of XRAM on the chip. The first 256 bytes of XRAM may be accessed using the MOVX A, @ R0, MOVX A, @ R1, MOVX @ R0, A, and MOVX @ R1, A instructions. The full 64 KB may be accessed using MOVX A, @ DPTR and MOVX @ DPTR, A. The 16-bit address requires the ...
An AT89c2051 microcontroller in circuit. The Atmel AT89 series is an Intel 8051-compatible family of 8 bit microcontrollers (μCs) manufactured by the Atmel Corporation.. Based on the Intel 8051 core, the AT89 series remains very popular as general purpose microcontrollers, due to their industry standard instruction set, their low unit cost, and the availability of these chips in DIL (DIP ...
M6032 is an 8051-based Microcontroller with Dual Data Pointers, UART, 32 I/O lines, 3 Timers/Counters, 6 Interrupts/2 priority levels, 256 Bytes IDATA RAM, 256 Bytes on-chip XRAM. M6759 is an 8051-based Microcontroller with Dual Data Pointers, UART, 32 I/O lines, 3 Timers/Counters, 6 Interrupts/2 priority levels, 64 KB Flash ROM, 256 Bytes ...
256 — 0 256 (EDAC-based, -1000 and -1002 models) 512 (parity-based, -1010 model) Tower 1990 [61] NCR: System 3445 Intel 80486: 33 — None or 200 MB or 327 MB or 670 MB 4 16 Tower 1990 [62] NCR: System 3550 Intel 80486DX2 (up to 8 identical processors) 50 256 (external; 8 KB internally per processor) 320 MB – 13 GB 16 256 Tower 1990 [63 ...
An 8-bit register can store 2 8 different values. The range of integer values that can be stored in 8 bits depends on the integer representation used. With the two most common representations, the range is 0 through 255 (2 8 − 1) for representation as an binary number, and −128 (−1 × 2 7) through 127 (2 7 − 1) for representation as two's complement.
For instance, many 8-bit processors, such as the MOS Technology 6502, supported 16-bit addresses— if not, they would have been limited to a mere 256 bytes of memory addressing. The 16-bit Intel 8088 and Intel 8086 supported 20-bit addressing via segmentation , allowing them to access 1 MiB rather than 64 KiB of memory.
Turbo51 is a compiler for the programming language Pascal, for the Intel MCS-51 (8051) family of microcontrollers. It features Borland Turbo Pascal 7 syntax, support for inline assembly code, source-level debugging, and optimizations, among others. The compiler is written in Object Pascal and produced with Delphi.
Models with >256 bytes of data address space (≥256 bytes of RAM) have a 16-bit stack pointer, with the high half in the SPH register. Models with >8 KiB of ROM add the 2-word (22-bit) JUMP and CALL instructions. (Some early models suffer an erratum if a skip instruction is followed by a 2-word instruction.)