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Bits can be set, cleared, ANDed, ORed etc, with a single instruction. • 8051 ports are bit-addressable, simplifying the interface to single bit inputs and outputs Example: ANLC,25H. • AND's bit 25H with the carry flag and places the result back in the carry flag. • Auxiliary carry flag (AC): is set if a carry was generated out of bit
Instruction Set. 2-72. Instruction Set Summary. Note: Key: [2B] = 2 Byte, [3B] = 3 Byte, [2C] = 2 Cycle, [4C] = 4 Cycle, Blank = 1 byte/1 cycle. 0. 1. 2. 3. 4. 5. 6. 7. 0. NOP. JBC bit,rel. [3B, 2C] Example: The Accumulator holds 0C3H (11000011B) and register 0 holds 0AAH (10101010B) with the carry flag set. The following
3 Oct 2003 Core8051 Instruction Set Details User's Guide. 1. Introduction. This guide contains detailed information about all of the instructions supported by Core8051. A brief example of how each instruction might be used is given, as well as its effect on the Program. Status Word (PSW) flags from the ALU.
Boolean Variable Instructions. ? The C8051 processor can perform single bit operations. ? The operations include set, clear, and, or and complement instructions. ? Also included are bit–level moves or conditional jump instructions. ? All bit accesses use direct addressing. ? Examples: SETB TR0. ;Start Timer0. POLL: JNB.
0509C–8051–07/06. Section 1. 8051 Microcontroller Instruction Set. For interrupt response time information, refer to the hardware description chapter. Note: 1. Operations on SFR byte Example: The Accumulator holds 0C3H (11000011B) and register 0 holds 0AAH (10101010B) with the carry flag set. The following
WS@-51 PROGRAMMER'SGUIDEAND INSTRUCTION SET. INSTRUCTION DEFINITIONS. ACALL addrll. Function: Deaoription: Example: Bytw. Cyclw. Encoding: AbsoluteCall. ACALL unconditionallycalls a subroutinelocated at the indicatedaddress.The instruction incrementsthe PC twim to obtain the address of the
where individual memory bits in Internal RAM can be set or cleared. In all there are. 128 bits numbered 00h to 7Fh. Being bit variables any one variable can have a value 0 or 1. A bit variable can be set with a command such as SETB and cleared with a command such as CLR. Example instructions are: SETB 25h ; sets the
2011. Microcontrollers- 2nd Ed. Raj Kamal. Pearson Education. 5. • It defines NOP instruction. Example- 8051 Machine code. 00H. • NOP means no operation; PC sets to new value and processor fetches next from 1001H. • Let current PC = 1000H. Let 00H is stored at that address. • Processor when fetches machine code.
fully compatible in architecture and software to the standard 8051 microcontroller family. Especially, they are .. Figure 2-4 shows an example for the interrupt vector addresses of a C500 microcontroller (C501). .. programmed with the same instruction set common to the basic member, the SAB 8051. Thus, the C500 family
8051 Instruction Set Summary. Rn. Register R7-R0 of the currently selected Register Bank. Data. 8-bit internal data location's address. This could be an internal Data. RAM location (0-127) or a SFR [i.e. I/O port, control register, status register, etc. (128-255)]. @Ri. 8-bit Internal Data RAM location (0-255) addressed indirectly
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