Page 232 - Making PIC Microcontroller Instruments and Controllers

tHE t|lrERz DeOGFtt

1100 13
I 1 0 1 t4
1110 l 5

1 1 1 1 16

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PIEI.I and INTCON.6 control the intenupt enable bit
The interrupt flag is located at PIRI.1.
Like all the timers, Timer2 is clocked by the crystal frequoncy divjded by 4 (or
Fosc/4). It can rotbe used with an external oscillator
The timer is controlled by T2CON.2 and is on when this bit is set to 1.

The listing in Program 16.6 shows how Timer2 can be used to create a meuonome.
Compare this to the listings for Timelo and Timerl mentioned prcviously.

iPtlCiSIF.;Iry Me onome usins rimer2
; Like we did for: TIMERO, f,I st 1et us se! up lhe LCD
CI,EAR always starC wiLh clear
DEFTNE OSC { def,ne oscillalor speed
DEFINE !,CD_DREG PORIID def,ne LcD conneclions
DEFINE I,CD_DBIT 4
DEFINE I,CD_RSREG PORITE
DEFINE I,CD_RSBIT O
DEFINE ',CD_ER3G PORTE enable register
DEFTNE T,CD_EBIT 1
NOW PORTE.2 nake low for wrile only
; Set Lhe port direclions. We
; PORTE as oulpuls
; even lhough PORTE has only 3 lines, The other 5 lines will

' ' - - r s p 6 a < a r

TRJSC - %11111011 fne speaKer
to an outpuC line
rRIsD - 200000000 set all PoRTD lines to
rRrsE = %00000000 set all PoRTE lines ro
PORIE.2=0