Dear Steve M. Taylor,


( This means fosc/4, so how 3Khz can be set here )
MOV CMOD, #02H ; Clock input 4 250 nsec at 16 MHz

( What does this do ? )
MOV CL, #00H ; Frequency of output 4 15.6 KHz
MOV CH, #00H

( This selects PWM, HSO, or watch dog )
MOV CCAPM0, #42H ; Module 0 in PWM mode

( This does what ? )
MOV CCAP0L, #00H

( This i understand )
MOV CCAP0H, #128D ; 50 percent duty cycle

( This i understand )
SETB CR ; Turn on PCA timer