Additional copies of this document or other Intel literature maybe obtained from: Intel Corporation. Literature , and 80C51 Hardware. Description. The Intel AH is a MCS NMOS single-chip 8-bit microcontroller with 32 I/O lines, 2 Timers/Counters, Instruction Set Manual for the Intel AH. The MCS 51 CHMOS microcontroller products are fabricated on Intel’s reliable AN80C51 indicates an automotive temperature range version of the 80C51 in a.

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ADDC Adata. This is “program store enable”. They were identical except for the non-volatile memory type. The has 4 selectable banks of 8 addressable 8-bit registers, R0 to R7.

SUBB Adata. Retrieved 5 January When stored on EEPROM or Flash, the program memory can be rewritten when the microcontroller is in the special programmer circuit or, if not using athrough a preinstalled bootloader. Inyel 32 bytes from 0x00—0x1F memory-map the 8 registers R0—R7. Instructions that operate on single bits are:. ANL addressdata.


The 80C has fail-safe mechanisms, analog signal processing facilities and timer capabilities and 8 KB on-chip program memory. In some engineering schools, the microcontroller is used in introductory microcontroller courses.

Retrieved from ” https: The success of the Intel spawned a number of clones, which are collectively referred to as the MCS family of microcontrollers, which includes chips from vendors such as Atmel, Philips, Infineon, and Texas Instruments.

It may be on- or off-chip, depending on the particular model of chip being used. External data memory XRAM is a third address space, also starting at address 0, and allowing 16 bits of address space. The Short and Standard chips are often available in DIP dual in-line package form, but the Extended models often have a different form factor, and are not “drop-in compatible”. This part was available in a ceramic package with a clear quartz window over the top of the die so UV light could be used to erase the EPROM memory.

Archived at the Wayback Machine. Register select 0, RS0. Often used as the general register for bit computations, or the “Boolean accumulator”. RL A rotate left. One feature of the core is the inclusion of a boolean processing engine which allows bit -level boolean logic operations to be carried out directly and efficiently on select internal registersports and select RAM locations.


The Intel microcontroller is one of the most popular general purpose microcontrollers in use today. If we use multiple memory chips then this pin is used to distinguish between them.

MCS based microcontrollers have been adapted to extreme environments.

May be 80c15 and written by software; not otherwise affected 80c511 hardware. RLC A rotate left through carry. By using this site, you agree to the Terms of Use and Privacy Policy.

Not all support all addressing modes; the immediate mode in particular is unavailable where the flexible operand is written to. Time to execute an instruction is found by multiplying C by 12 and dividing product by Crystal frequency. JZ offset jump if zero. More than 20 independent manufacturers produce MCS compatible processors.

The irregular instructions comprise 64 opcodes, having more limited addressing modes, plus several opcodes scavenged from inapplicable modes in the regular instructions.

Retrieved 11 October Policies and guidelines Contact us. RRC A rotate right through carry. Register select 1, RS1.


Embedded Systems/ Microcontroller – Wikibooks, open books for an open world

It is an example of a complex instruction set computerand has separate memory spaces for program instructions and data Harvard architecture.

All Silicon Labssome Dallas and 80×51 few Atmel devices have single cycle cores. Auxiliary carryAC. They can not be accessed indirectly via R0 or R1; indirect access to those addresses will access the second half of IRAM.

Intel MCS-51

The operations specified by the most significant nibble are as follows. MOV Adata. Most modern compatible microcontrollers include these features.