MC68HC705P9CS datasheet(104/160 Pages) FREESCALE

104 / 160 page

Timer

Technical Data

MC68HC705P9 — Rev. 4.0

104

Timer

MOTOROLA

Figure 9-3. Input Capture Operation

9.4.3 Output Compare

The output compare function is a means of generating an output signal

when the 16-bit counter reaches a selected value. Software writes the

selected value into the output compare registers. On every fourth

internal clock cycle the output compare circuitry compares the value of

the counter to the value written in the output compare registers. When a

match occurs, the timer transfers the programmable output level bit

(OLVL) from the timer control register to the TCMP pin.

Software can use the output compare register to measure time periods,

to generate timing delays, or to generate a pulse of specific duration or

a pulse train of specific frequency and duty cycle on the TCMP pin.

Figure 9-4 shows the logic of the output compare function.

Figure 9-4. Output Compare Operation

TCAP

EDGE

SELECT/

DETECT

LOGIC

TRH

TRL

ICRH

ICRL

ICIE

IEDG

ICF

TIMER

INTERRUPT

REQUEST

16-BIT COMPARATOR

OCRH ($0016)

OCRL ($0017)

16-BIT COUNTER

TCMP

CONTROL

LOGIC

OCIE

OLVL

OCF

TIMER

INTERRUPT

REQUEST

Freescale Semiconductor, Inc.

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