Rainbow Electronics AT89C51SND1C - Manual (Page 206)

Table of Contents
i
Features ................................................................................................. 1
Description ............................................................................................ 1
Typical Applications ............................................................................. 2
Block Diagram ....................................................................................... 2
Pin Description ...................................................................................... 3
Pinouts ................................................................................................................. 3
Signals................................................................................................................... 6
Internal Pin Structure.......................................................................................... 11
Clock Controller .................................................................................. 12
Oscillator ............................................................................................................ 12
X2 Feature.......................................................................................................... 12
PLL ..................................................................................................................... 13
Registers ............................................................................................................. 15
Program/Code Memory ...................................................................... 17
ROM Memory Architecture ................................................................................. 17
Flash Memory Architecture ................................................................................ 18
Hardware Security System .................................................................................. 19
Boot Memory Execution ..................................................................................... 19
Preventing Flash Corruption............................................................................... 20
Registers ............................................................................................................. 21
Hardware Bytes ................................................................................................... 22
Data Memory ....................................................................................... 23
Internal Space .................................................................................................... 23
External Space .................................................................................................... 25
Dual Data Pointer ............................................................................................... 27
Registers ............................................................................................................ 28
Special Function Registers ................................................................ 30
Interrupt System ................................................................................. 36
Interrupt System Priorities .................................................................................. 36
External Interrupts .............................................................................................. 39
Registers ............................................................................................................. 40
Power Management ............................................................................ 46