Atmel 8051 User Manual

Atmel 8051 Microcontrollers
Hardware Manual

Atmel 8051 Specifications

General

Brand	Atmel
Model	8051
Category	Microcontrollers
Language	English

Summary

Section 1: The 8051 Instruction Set

1.1 Program Status Word

Details the Program Status Word (PSW) register, its bits, and their functions.

1.2 Addressing Modes

Describes the various addressing modes used by the 8051 instruction set.

1.3 Arithmetic Instructions

Lists and explains the arithmetic instructions available on the 8051.

1.4 Logical Instructions

Details the bitwise logical operations performed by the 8051 instruction set.

1.5 Data Transfers

Covers instructions for moving data between registers and memory.

1.6 External RAM

Details instructions for accessing external data memory.

1.7 Lookup Tables

Describes instructions for reading data from program memory tables.

1.8 Boolean Instructions

Covers the 8051's single-bit processor and its instructions.

1.9 Jump Instructions

Explains instructions that alter program flow, including jumps and calls.

1.10 Read-Modify Write Instruction Features

Explains instructions that read, modify, and write back data.

1.11 Instruction Set Summary

Provides a comprehensive list of 8051 instructions with byte and cycle counts.

1.12 Instructions That Affect Flag Settings

Lists instructions that modify the status flags in the PSW register.

1.13 Instruction Table

Presents a table of 8051 instructions with hex values and execution times.

1.14 Instruction Definitions

Provides detailed descriptions and operation of individual 8051 instructions.

Section 2: Common Features Description

2.1 Introduction

Introduces the chapter on on-chip hardware features of 8051 microcontrollers.

2.2 Special Function Registers

Details the Special Function Register (SFR) map and key registers.

2.3 Oscillator and Clock Circuit

Explains the on-chip oscillator and clock generation system.

2.4 CPU Timing

Details the CPU's fetch/execute cycles and timing characteristics.

2.5 Port Structures and Operation

Details the structure and operation of the 8051's I/O ports.

2.6 Accessing External Memory

Explains accessing external program and data memory via 8051 pins.

2.8 ALE

Explains the Address Latch Enable (ALE) signal for address multiplexing.

2.9 Timer/Counters

Introduces the two general-purpose 16-bit timers/counters in the 80C51.

2.10 Timer 0

Details the four operating modes of Timer 0.

2.11 Timer 1

Details Timer 1's operation, similar to Timer 0 but with mode 3 differences.

2.12 Timer 2

Details Timer 2 features: capture, auto-reload, and baud rate generation.

2.13 Serial Interface

Describes the Universal Asynchronous Receiver/Transmitter (UART) features.

2.14 Framing Error Detection

Explains the feature for detecting framing errors in asynchronous serial modes.

2.15 Automatic Address Recognition

Describes hardware feature for multiprocessor communication address matching.

2.16 Interrupts

Covers interrupt handling, priority levels, and response times.