Datasheet

238
4341H–MP3–10/07
AT8xC51SND2C/MP3B
1. Description ............................................................................................... 2
2. Typical Applications ................................................................................ 2
3. Block Diagram .......................................................................................... 3
4. Pin Description ......................................................................................... 4
4.1 Pinouts ..................................................................................................................... 4
4.2 ................................................................................................................................. 5
4.3 Signals...................................................................................................................... 6
4.4 Internal Pin Structure.............................................................................................. 12
5. Clock Controller ..................................................................................... 13
5.1 Oscillator ................................................................................................................ 13
5.2 X2 Feature.............................................................................................................. 14
5.3 PLL ......................................................................................................................... 14
5.4 Registers ................................................................................................................ 16
6. Program/Code Memory ......................................................................... 18
6.1 ROM Memory Architecture ..................................................................................... 19
6.2 Flash Memory Architecture .................................................................................... 19
6.3 Hardware Security System ..................................................................................... 20
6.4 Boot Memory Execution ......................................................................................... 20
6.5 Preventing Flash Corruption................................................................................... 21
6.6 Registers ................................................................................................................ 22
6.7 Hardware Bytes ...................................................................................................... 22
7. Data Memory .......................................................................................... 24
7.1 Internal Space ........................................................................................................ 24
7.2 External Space ....................................................................................................... 25
7.3 Dual Data Pointer ................................................................................................... 27
7.4 Registers ................................................................................................................ 29
8. Special Function Registers ................................................................... 31
9. Interrupt System .................................................................................... 37
9.1 Interrupt System Priorities ...................................................................................... 37
9.2 External Interrupts .................................................................................................. 40
9.3 Registers ................................................................................................................ 41
10. Power Management ............................................................................... 47
10.1 Reset .................................................................................................................... 47