
3819 Group USER’S MANUAL
i
Table of contents
Description ........................................................................................................................................ 2
 Features ............................................................................................................................................. 2
 Applications ...................................................................................................................................... 2
 Pin description ................................................................................................................................. 4
 Part numbering ................................................................................................................................ 6
 Group expansion ............................................................................................................................. 7
 Functional description .................................................................................................................... 8
 Memory .............................................................................................................................................. 9
 ROM ............................................................................................................................................ 9
 Interrupt vector area .................................................................................................................... 9
 Zero page .................................................................................................................................... 9
 I/O ports .......................................................................................................................................... 11
 Interrupt operation ..................................................................................................................... 17
 Notes on use ............................................................................................................................. 17
 Timers .............................................................................................................................................. 19
 Timer 1 and timer 2 ................................................................................................................... 19
 Timer 3 and timer 4 ................................................................................................................... 19
 Timer 5 and timer 6 ................................................................................................................... 19
 Serial I/O ......................................................................................................................................... 23
 FLD controller ................................................................................................................................ 33
 Noise filter ...................................................................................................................................... 45