ST10F166 datasheet(23/62 Pages) STMICROELECTRONICS

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ST10F166

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13 CAPTURE/COMPARE UNIT (CAPCOM)

The CAPCOM unit supports generation and control of timing sequences on up to 16

channels, with a maximum resolution of 400 ns. The CAPCOM unit is typically used

to handle high speed I/O tasks such as pulse and waveform generation, pulse width

modulation (PWM), Digital to Analog (D/A) conversion, software timing, or time re-

cording relative to external events.

Two 16-bit timers (T0/T1) with reload registers provide two independent time bases

for the capture/compare register array.

The input clock for the timers is programmable to several prescaled values of the in-

ternal system clock, or may be derived from an overflow/underflow of timer T6 in

module GPT2. This provides a wide range of variation for the timer period and reso-

lution and allows precise adjustment to the application specific requirements. In addi-

tion, an external count input for CAPCOM timer T0 allows event scheduling for the

capture/compare registers relative to external events.

The capture/compare register array contains 16 dual purpose capture/compare reg-

isters, each of which may be individually allocated to either CAPCOM timer T0 or T1,

and programmed for capture or compare function. Each register has one port pin as-

sociated with it which serves as an input pin for triggering the capture function, or as

an output pin to indicate the occurrence of a compare event.

When a capture/compare register has been selected for capture mode, the current

contents of the allocated timer will be latched (’captured’) into the capture/compare

generated. Either a positive, a negative, or both a positive and a negative external

signal transition at the pin can be selected as the triggering event. The contents of all

registers which have been selected for one of the five compare modes are continu-

ously compared with the contents of the allocated timers. When a match occurs be-

tween the timer value and the value in a capture/compare register, specific actions

will be taken based on the selected compare mode.

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