looking for that one ???

Code:
Making all these decisions and calculations was the hard bit (honest)... the easy bit is the programming... 



' 
' Program BatLo 
' ============ 
' Embedded Software Version 1.00 
' Target Processor PIC16F628-04/P 
' Target PCB BB-001 
' 

Created 09/04/02 
' Last Updated 09/04/02 
' Written by Melanie Newman 
' 
' Melanies very complicated Battery Low Indicator 
' 

' 
' Device 

Programming Options 
' -------------------------- 
@ DEVICE pic16F628, INTRC_OSC_NOCLKOUT 
' System Clock Options 
@ DEVICE pic16F628, WDT_ON 
' 

Watchdog Timer 
@ DEVICE pic16F628, PWRT_ON 
' Power-On Timer 
@ DEVICE pic16F628, MCLR_OFF 
' Master Clear Options (Internal) 
@ DEVICE 

pic16F628, BOD_ON 
' Brown-Out Detect 
@ DEVICE pic16F628, LVP_OFF 
' Low-Voltage Programming 
@ DEVICE pic16F628, CPD_OFF 
' Data Memory 

Code Protect 
@ DEVICE pic16F628, PROTECT_OFF 
' Program Code Protection 

' 
' Hardware Assignments 
' -------------------- 
BatVal var CMCON.7 


' Read Comparator 2 for Battery Low 
' Port RA1 has +VBatt Input 
BatLoLED var PORTB.7 
' Port for Battery Low LED 

' 
' Start Program 
' 

============ 

' 
' Setup Hardware 
' -------------- 
' 
' Comparator Control 
' ------------------ 
CMCON=%00100101 
' CM7 C2OUT 

Comparator Output 2 (Read Only) 
' CM6 C1OUT Comparator Output 1 (Read Only) 
' CM5 C2INV Comparator 2 Output Inversion 
' the way I'm driving my LED I need 

inversion 
' so C2OUT goes Low when Battery is Low 
' CM4 C1INV Comparator 1 Output Inversion 
' CM3 Comparator Input Switch 
' not relevant for Comparator 

Mode 101 
' CM2 ) refer to Datasheet figure 9-1 
' CM1 ) Mode 101 for Single Comparator C2 
' CM0 ) Comparator C1 Disabled 
' 
' Voltage Reference Control 


' ------------------------- 
VRCON=%11101100 
' 7 VREN Voltage Reference Enable (1=on) 
' 6 VRON VREF Output Enable 
' 1=Connects output of VREF to RA2 


' This is real convenient so we'll use it 
' 5 VRR VREF Range Selection (1=Low Range) 
' 4 Unused (0) 
' VR3 ) 
' VR2 ) Set for Reference Voltage 
' VR1 

) 1100 sets 2.5v in Low Range 
' VR0 ) 
' 
Pauseus 10 
' Delay to allow for VREF to settle 
' see datasheet section 11-1 
' 
' And the Usual Stuff 
' 

------------------- 
TRISA=%11111111 ' Set All Inputs 
TRISB=%00000000 ' Set All Outputs 

' 
' Actual Program 
' -------------- 
BatLoLoop: 


BatLoLED=BatVal 
' You better believe it... just ONE line of code! 
Goto BatLoLoop 

' 
End
Alain