Philips P89LPC920 User Manual page 5

Philips Semiconductors
Comparator configuration ........................................................................................ 79
Internal reference voltage........................................................................................ 80
Comparator interrupt ............................................................................................... 80
Comparators and power reduction modes .............................................................. 80
Comparator configuration example ......................................................................... 81
12. Keypad Interrupt (KBI)............................................................................. 83
13. Watchdog Timer ...................................................................................... 85
Watchdog Function.................................................................................................. 85
Feed Sequence ....................................................................................................... 86
Watchdog Clock Source .......................................................................................... 88
Watchdog Timer in Timer Mode .............................................................................. 89
Power down operation............................................................................................. 90
Periodic wakeup from Power down without an external oscillator........................... 90
14. Additional Features.................................................................................. 91
Software reset ......................................................................................................... 91
Dual Data Pointers .................................................................................................. 91
15. Flash Memory.......................................................................................... 93
General description ................................................................................................. 93
Features .................................................................................................................. 93
Flash programming and erase................................................................................. 93
Using Flash as data storage: IAP-Lite ..................................................................... 93
In-Circuit Programming (ICP) .................................................................................. 97
ISP and IAP capabilities of the P89LPC920/921/922.............................................. 97
Boot ROM................................................................................................................ 98
Power-On reset code execution .............................................................................. 98
Hardware activation of the Boot Loader .................................................................. 98
In-System Programming (ISP)................................................................................. 99
Using the In-System Programming.......................................................................... 99
In-Application Programming method ....................................................................... 104
IAP Authorization Key.............................................................................................. 104
User configuration bytes.......................................................................................... 109
User security bytes .................................................................................................. 110
Boot Vector.............................................................................................................. 111
Boot Status .............................................................................................................. 111
16. Instruction set .......................................................................................... 113
17. Revision History....................................................................................... 117
18. Index........................................................................................................ 119
2003 Dec 8
5
User Manual - Subject to Change
P89LPC920/921/922