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The following is a partial list of the ‘s registers, which are memory-mapped into the special function register space:. Most modern compatible microcontrollers include these features. RR A rotate right.

Gives the parity XOR of the bits of the accumulator, A. To use this chip, external ROM datasjeet to be added containing the program that the would fetch and execute. The MCS family was also discontinued by Intel, but is widely available in binary compatible and partly enhanced variants from many manufacturers.

JNB bitoffset jump if bit clear. Instruction mnemonics use destinationsource operand order. Modern cores are faster datashedt earlier packaged versions. Set when addition produces a carry from bit 3 to bit 4. Bits are always specified by absolute addresses; there is no register-indirect or indexed addressing.

It may be on- or off-chip, depending on the particular model of chip being used. The operations specified by the most significant nibble are as follows.


IRAM from 0x00 to 0x7F can be accessed directly. ADD Adata. Single-board microcontroller Special function register.

The low-order bit of the register bank. Retrieved from ” https: ORL Adata. JB bitoffset jump if bit set. XRL addressdata.

Intel MCS – Wikipedia

CJNE Adata,offset. Some derivatives integrate a digital signal processor DSP. Instructions that operate on single bits are:. The main program then performs serial reads and writes simply by reading and writing 8-bit data to stacks.

JZ offset jump if zero. MCS based microcontrollers have been adapted to extreme environments. One of the reasons for the ‘s popularity is its range of operations on single bits. With one instruction, the can switch register banks versus the time consuming task of transferring the critical registers to the stack, or designated RAM locations.

Intel MCS-51

The SJMP short jump opcode takes the signed relative offset byte operand and transfers control there relative to the address of the following instruction. Register datasueet 0, RS0.

RRC A rotate right through carry. The MCS family was also discontinued by Intel, but is widely available in binary compatible and partly enhanced variants. It can also be on- or off-chip; what makes it “external” is that it must be accessed using the MOVX move external instruction.


CamelForth datashert the “. Program memory is read-only, though some variants of the use on-chip flash memory and provide a method of re-programming the memory in-system or in-application.

The is designed as a Harvard architecture with segregated memory Data and Instructions ; it can only execute code fetched from program memory, and has no instructions to write to 8013 memory. This made them more suitable for battery-powered devices. Archived from the original on There are many commercial C compilers.

Archived from the original on 30 May RLC A rotate left through carry. You can help by adding to it. SJMP offset short jump. ANL Cbit.


It is an example of a complex instruction set computerand has separate memory spaces for program instructions and data Harvard architecture. Often used as the general register for bit computations, or the “Boolean accumulator”.

Register select 1, RS1. XRL Adata. The ‘s predecessor, the datasheer, was used in the keyboard of the first IBM PCwhere it converted keypresses into the serial data stream which is sent to the main unit of the computer.

Retrieved 5 January