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8051 Tutorial Index Introduction Introduction Chapter 1 - Types of Memory Code Memory Internal RAM External RAM Special Function Registers (SFRs) Bit Memory Chapter 2 - Special Function Registers What are SFRs? Types of SFRs Standard SFR Descriptions Non-Standard SFRs Chapter 3 - Basic Registers The Accumulator "R" Registers B Register Data Pointer (DPTR) Program Counter (PC) Stack Pointer (SP) Chapter 4 - Addressing Modes Immediate Addressing Direct Addressing Indirect Addressing External Direct Addressing External Indirect Addressing Chapter 5 - Program Flow Conditional Branching Direct Jumps Direct Calls Return from Subroutines Interrupts Chapter 6 - Low-Level Information Instruction Set, Timing, and Low-Level Info Chapter 7 - Timers How Timers Count Measuring Time How Long do Timers Take to Count? Timer SFRs TMOD SFR Mode 0 - 13-bit Timer Mode 1 - 16-bit Timer Mode 2 - Auto-reload Timer Mode 3 - Split Timer TCON SFR Initializing a Timer Reading a Timer Reading a Timer Value Detecting a Timer Overflow Timing the Length of an Event Timers as Event Counters Chapter 8 - Serial Port Operation Setting the Serial Port Mode Setting the Baud Rate Writing to the Serial Port Reading from the Serial Port Chapter 9 - Interrupts Events that trigger Interrupts Setting Up Interrupts Polling Sequence Interrupt Priorities What Happens When an Interrupt Occurs? What Happens When an Interrupt Ends? Serial Interrupts Register Protection Common Bugs in Interrupts Additional Features in 8052 Introduction to 8052 256 bytes of additional Internal RAM New SFRs for 8052's Third Timer T2CON SFR Timer 2 as a Baud-Rate Generator Timer 2 in Auto-Reload Mode Timer 2 in Capture Mode Timer 2 Interrupt Reference 8052 Instruction Set SUGGESTIONS? COMMENTS? CORRECTIONS? We've made every effort to make this tutorial as complete, accurate, and easy to read as possible. However, if you have any suggestions, comments, or corrections, please e-mail us and let us know. (C) Copyright 1997 - 2001 by Vault Information Services. All Rights Reserved. Information provided "as-is" without warranty. Please see details. Contact us for usage and copy permission.