W78IRD2 datasheet(45/76 Pages) ETC2

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W78IRD2

Publication Release Date: October 2, 2006

- 45 -

Revision A7

MODULE FUNCTION

ECOMN CAPPN CAPNN MATN

TOGN

PWMN ECCFN

No operation

16-bit capture by a positive edge

trigger on CEXn

16-bit capture by a negative trigger

on CEXn

16-bit capture by a transition on

CEXn

16-bit Software Timer

16-bit High Speed Output

8-bit PWM

Watchdog Timer (only in module4)

PCA Module Modes (CCAPMn Register)

PWM enables pulse width modulation. The TOG bit causes the output CEXn to toggle when there is a

match between the PCA counter and the module’s compare/capture register. The match bit MAT

causes the CCF bit in the CCON register to be set when there is a match between the PCA counter

and the module’s compare/capture register, and the ECCF bit enables the CCF flag to generate an

interrupt. The bits CAPP and CAPN determine whether positive and negative edges, respectively, are

captured. The bit ECOM enables the comparator function.

The PCA Timer is the common time-base for all five modules and can be programmed to select the

appropriate timer source. The default value is 12 clocks (12T) per machine cycle, and 6T can also be

selected by a bit in the options registers. The actual timer is then determined by the CPS1 and CPS2

bits in the CMOD SFR, as follows:

CPS1

CPS0

PCA TIMER COUNT SOURCE FOR 12T

PCA TIMER COUNT SOURCE FOR 6T

Oscillator frequency / 12

Oscillator frequency / 6

Oscillator frequency / 4

Oscillator frequency / 2

Timer 0 overflow

External input at ECI pin

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