Rainbow Electronics AT89C5122 - Manual (Page 210)

210
4202E–SCR–06/06
AT8xC5122/23
Table of Contents
Features ................................................................................................. 1
Reference Documents .......................................................................................... 2
Product Description .............................................................................................. 3
AT8xC5122 Block Diagram .................................................................................. 5
AT83C5123 Block Diagram ..................................................................................5
Pinout .................................................................................................... 6
High Pin Count Package Description.................................................................... 6
Low Pin Count Package Description .................................................................. 11
Pin Description.................................................................................................... 13
Typical Applications ........................................................................... 17
Recommended External components .................................................................17
USB Keyboard with Smart Card Reader Using the AT8xC5122 and AT89C5122DS Ver-
sions ............................................................................................................................. 18
USB Smart Card Reader Using the AT83C5123 Version................................... 19
Memory Organization ......................................................................... 20
Program Memory Managament .......................................................................... 20
Data Memory Managament ................................................................................ 21
Dual Data Pointer Register (DDPTR) ................................................................. 22
Registers............................................................................................................. 24
AT8xC5122’s CRAM and E2PROM Versions ....................................................26
AT8xC5122’s ROM Version................................................................................ 30
AT83C5123 Version ........................................................................................... 32
Special Function Registers (SFR’s) .................................................. 33
Introduction ......................................................................................................... 33
AT8xC5122 Version............................................................................................ 34
AT83C5123 Version ........................................................................................... 35
SFR’s Description ............................................................................................... 36
Clock Controller .................................................................................. 41
On-Chip Oscillator .............................................................................................. 41
Phase Lock Loop (PLL) ...................................................................................... 42
Clock Tree Architecture ...................................................................................... 43
Registers............................................................................................................. 50
I/O Port Definition ............................................................................... 53
Port Configuration............................................................................................... 57
Registers............................................................................................................. 61
Smart Card Interface Block (SCIB) ................................................... 64
Block Diagram .................................................................................................... 65