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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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This page was last edited on 22 Decemberat XRL addressA. This specifies the address of the next instruction to execute.

Retrieved from ” https: In other projects Wikimedia Commons. Enhancements mostly include new peripheral features and expanded arithmetic instructions. JBC bitoffset jump if bit set with clear.

Retrieved 22 August This page was last edited on 1 Decemberat When stored on EEPROM or Flash, the program memory can be rewritten when the microcontroller is in intek special programmer circuit or, if not using athrough a preinstalled bootloader.

RRC A rotate right through carry.

This section needs expansion. RLC A rotate left through carry. The SJMP short jump opcode takes the signed relative offset byte operand and transfers control there relative to the address of the following instruction.

External data 80c551 XRAM is a third address space, also starting at address 0, and allowing 16 bits of address space. From Wikipedia, the free encyclopedia.

Intel 8051AH

Instructions are all 1 to 3 bytes long, consisting of inteel initial opcode byte, followed by up to 2 bytes of operands. XRL addressdata. Where the least significant nibble of the opcode specifies one of the following addressing modes, the most significant specifies the operation:. May be read and written by software; not otherwise affected by hardware. Retrieved from ” https: Also, different status registers are mapped into the SFR, for use in checking the status of theand changing some operational parameters of the This article is based on material taken from the Inetl On-line Dictionary of Computing prior to 1 November and incorporated under the “relicensing” terms of the GFDLversion 1.


Intel MCS – Wikipedia

Views Read Edit View history. To access the other banks, we need to change the current bank number in the flag register. Instruction mnemonics use destinationsource operand order.

DA A decimal adjust. Overflow flagOV. Set when addition produces a carry from bit 3 to bit 4. Most systems respect this distinction, and so are unable to download and directly execute new programs. RR A rotate right. Therefore one machine cycle is 12 T-states. The has 4 selectable banks of 8 addressable 8-bit registers, R0 to R7. ANL Adata.

Today, s are still available as discrete parts, but they are mostly used as silicon intellectual property cores. To use this chip, external ROM had to be added containing the program that the would fetch and execute. One operand is flexible, while the second if any is specified by the operation: ADDC Adata.

Inyel bitoffset jump if bit inyel. JNC offset jump if carry clear. Retrieved 11 October Pin should be held high for 2 machine cycles.


The ‘s predecessor, thewas 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. Any bit of these bytes may be directly accessed by a variety of logical operations and conditional branches. P0 acts as AD0-AD7, as can be seen from fig 1. JB bitoffset jump if bit set. The A register works in a similar fashion to the AX register of x86 processors.

Relative branch instructions supply an 8-bit signed offset which is added to the PC.

ANL Cbit. Set when banks at 0x08 or 0x18 are in use. There are many commercial C compilers. Time to execute an instruction is found by multiplying Ibtel by 12 and dividing product by Crystal frequency.

Views Read Edit View history. Often used as the general register for bit computations, or the “Boolean accumulator”. RL A rotate left. They can not be accessed indirectly via R0 or R1; indirect access to those addresses will access the second half of IRAM.