Table of Contents
Features ................................................................................................. 1
Description ............................................................................................ 2
Key Features ......................................................................................... 2
Block Diagram ...................................................................................... 3
Application Information ....................................................................... 4
Very Low Voltage 1.8V System ............................................................................ 4
Low Voltage 3V System........................................................................................ 5
Pin Description ..................................................................................... 6
Pinouts.................................................................................................................. 6
Signals Description............................................................................................... 7
Internal Pin Structure...........................................................................................15
Power Management ............................................................................ 18
Power Supply...................................................................................................... 18
Power Reduction Mode ...................................................................................... 20
Reset .................................................................................................................. 23
Registers..............................................................................................................25
Clock Controller .................................................................................. 27
Oscillator............................................................................................................. 27
Clock Generator.................................................................................................. 28
System Clock Generator..................................................................................... 29
DFC/NFC Clock Generator................................................................................. 30
MMC Clock Generator........................................................................................ 31
SIO Clock Generator .......................................................................................... 32
Registers............................................................................................................. 33
Special Function Registers ............................................................... 36
SFR Pagination................................................................................................... 36
SFR Registers .................................................................................................... 37
Memory Space .................................................................................... 49
Memory Segments.............................................................................................. 49
Memory Configuration ........................................................................................ 50
Registers............................................................................................................. 51
Interrupt System ................................................................................. 55
Interrupt System Priorities .................................................................................. 55
External Interrupts .............................................................................................. 58
1
AT85C51SND3A
7632A–MP3–03/06
ATMEL [ ATMEL ]
