Atmel 8051 Microcontrollers Hardware Manual 1
4316E–8051–01/07
Table of Contents
Section 1
The 8051 Instruction Set....................................................................... 1-2
1.1 Program Status Word................................................................................1-2
1.2 Addressing Modes ....................................................................................1-3
1.3 Arithmetic Instructions...............................................................................1-5
1.4 Logical Instructions ...................................................................................1-6
1.5 Data Transfers .........................................................................................1-7
1.6 External RAM.........................................................................................1-10
1.7 Lookup Tables .......................................................................................1-10
1.8 Boolean Instructions ...............................................................................1-11
1.9 Jump Instructions ....................................................................................1-13
1.10 Read-Modify-Write Instruction Features .................................................1-15
1.11 Instruction Set Summary.........................................................................1-16
1.12 Instructions That Affect Flag Settings .....................................................1-20
1.13 Instruction Table .....................................................................................1-21
1.14 Instruction Definitions..............................................................................1-24
Section 2
Common Features Description ........................................................... 2-66
2.1 Introduction ............................................................................................2-66
2.2 Special Function Registers .....................................................................2-68
2.3 Oscillator and Clock Circuit.....................................................................2-70
2.4 CPU Timing.............................................................................................2-71
2.5 Port Structures and Operation ................................................................2-73
2.6 Accessing External Memory....................................................................2-77
2.7 PSEN ......................................................................................................2-78
2.8 ALE .........................................................................................................2-79
2.9 Timer/Counters .......................................................................................2-81
2.10 Timer 0 ....................................................................................................2-82
2.11 Timer 1 ....................................................................................................2-84
2.12 Timer 2 ....................................................................................................2-89
2.13 Serial Interface........................................................................................2-94
2.14 Framing Error Detection........................................................................2-104
2.15 Automatic Address Recognition ............................................................2-105
2.16 Interrupts ...............................................................................................2-112
