The 8051 micro-controller instructions are divided among five functional groups: Arithmetic Logical Data transfer Boolean variable Program branching 1. Arithmetic Instructions The arithmetic instructions are grouped together in Appendix A. Since four addressing modes are possible, the ADD A instruction can...
Bit set, reset, and test (Boolean instructions).Variety of addressing modes.2國立台灣大學生物機電系林達德611 37100 微處理機原理與應用 Lecture 15-715.2 8051 ArchitectureHardware Features of the 80510K (8031), ROM 4K (8051), EPROM 4K (8751)RAM 128 bytes (8XX1), 256 bytes (8XX2)(where ...
Microprocessor fetches data in different ways. The data usually stored in register, memory and can be used from immediate value. These different ways of accessing data is called addressing modes. Different microcontrollers have different addressing modes. It depends on design of manufacturers. 8051 has...
This is because the ultra-high-speed flash microcontroller uses different modes of addressing to reach each memory segment. These modes are described below. Program memory is the area from which all instructions are fetched. It is inherently read only. This is because the 8051 instruction set ...
Other 8051 derivatives, such as the Infineon SLE44/SLE66 fami- lies of smart card controllers, have additional 16-bit instructions and extended addressing modes for smart card applications. Both the SLE44 and the SLE66 are referred to as 16-bit smart card controllers in the data sheets, but...
3.4.3 Accesses to XRAM using the Registers R0/R1 (8-bit Addressing Mode) The 8051 architecture provides also instructions for accesses to external data memory range which use only an 8-bit address (indirect addressing with registers R0 or R1). The instructions are: MOVX MOVX A, @ Ri @Ri...
•Chapter2•Architectureofthe8051Microcontroller Contents:IntroductionBlockDiagramandPinDescriptionofthe8051RegistersSomeSimpleInstructionsStructureofAssemblylanguageandRunningan8051programMemorymappingin80518051FlagbitsandthePSWregisterAddressingModes16-bit,BCDandSignedArithmetic...
The instruction set supports direct, indirect and register addressing modes. Program memory can be addressed using indexed addressing. The core registers are comprised of an accumulator, a stack pointer and dual data pointer registers in addition to the general registers. Data memory is split into ...
There is no conflict or overlap among the 256 bytes Scratchpad RAM and the 1K Bytes MOVX SRAM as they use different addressing modes and separate instructions. The on-chip MOVX SRAM is enabled by setting the DME0 bit in the PMR register. After a reset, the DME0 bit is cleared such ...
(ISP) HARDWARE FEATURES I/O Pins Enhanced LED I/O Drivers SPI Port Full Duplex Serial UART Watchdog Timer Timer/Counters Analogue Comparator IDLE and Power Down modes Dual Data Pointer Interrupt sources MISCELLANEOUS On-chip RC Oscillator Max External Clock Frequency VCC Voltage Range (V) Brown-...