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The only register on an 8051 that is not memory-mapped is the 16-bit program counter (PC). This specifies the address of the next instruction to execute. Relative branch instructions supply an 8-bit signed offset which is added to the PC. Eight general-purpose registers R0–R7 may be accessed with instructions one byte shorter than others.
These first instruction shall push the value stored in AX (16-bit register) to the stack. This is done by subtracting a value of 2 (2 bytes) from SP. The new value of SP becomes 0xF81E. The CPU then copies the value of AX to the memory word whose physical address is 0x1F81E. When "PUSH BX" is executed, SP is set to 0xF81C and BX is copied to ...
Sign-extend 32-bit value in EAX to 64-bit value in EDX:EAX. Mainly used to prepare a dividend for the 32-bit IDIV (signed divide) instruction. CWD: JECXZ rel8: E3 cb [f] Jump if ECX is zero: JCXZ: PUSHAD: 60: Push all 32-bit registers onto stack [g] PUSHA: POPAD: 61: Pop all 32-bit general-purpose registers off stack [h] POPA: PUSHFD: 9C: Push ...
The FLAGS register is the status register that contains the current state of an x86 CPU.The size and meanings of the flag bits are architecture dependent. It usually reflects the result of arithmetic operations as well as information about restrictions placed on the CPU operation at the current time.
The Small Device C Compiler (SDCC) is a free-software, partially retargetable [1] C compiler for 8-bit microcontrollers. It is distributed under the GNU General Public License. The package also contains an assembler, linker, simulator and debugger. SDCC is a popular open-source C compiler for microcontrollers compatible with Intel 8051/MCS-51 ...
The choice of segment is normally defaulted by the processor according to the function being executed. Instructions are always fetched from the code segment. Any stack push or pop or any data reference referring to the stack uses the stack segment. All other references to data use the data segment.
Learn how to download and install or uninstall the Desktop Gold software and if your computer meets the system requirements.
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