SPMCK16Z4MPV20 datasheet(271/500 Pages) FREESCALE

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M68HC16 Z SERIES

GENERAL-PURPOSE TIMER

USER’S MANUAL

11-7

Interrupt requests are asserted until associated status flags are cleared. Status flags

must be cleared in a particular sequence. The status register must first be read for set

flags, then zeros must be written to the flags that are to be cleared. If a new event oc-

curs between the time that the register is read and the time that it is written, the asso-

ciated flag is not cleared.

For more information on interrupts, refer to 5.8 Interrupts. For more information on

exceptions, refer to 4.13.4 Types of Exceptions.

11.5 Pin Descriptions

The GPT uses 12 of the MCU pins. Each pin can perform more than one function. De-

scriptions of GPT pins divided into functional groups follow.

11.5.1 Input Capture Pins

Each input capture pin is associated with a single GPT input capture function. Each

pin has hysteresis. Any pulse longer than two system clocks is guaranteed to be valid

and any pulse shorter than one system clock is ignored. Each pin has an associated

16-bit capture register that holds the captured counter value. These pins can also be

used for general-purpose I/O. Refer to 11.8.2 Input Capture Functions for more in-

formation.

11.5.2 Input Capture/Output Compare Pin

The input capture/output compare pin can be configured for use by either an input cap-

ture or an output compare function. It has an associated 16-bit register that is used for

holding either the input capture value or the output match value. When used for input

capture the pin has the same hysteresis as other input capture pins. The pin can be

used for general-purpose I/O. Refer to 11.8.2 Input Capture Functions and 11.8.3

Output Compare Functions for more information.

11.5.3 Output Compare Pins

Output compare pins are used for GPT output compare functions. Each pin has an as-

sociated 16-bit compare register and a 16-bit comparator. Pins OC2, OC3, and OC4

are associated with a specific output compare function. The OC1 function can affect

the output of all compare pins. If the OC1 pin is not needed for an output compare

function it can be used to output the clock selected for the timer counter register. Any

of these pins can also be used for general-purpose I/O. Refer to 11.8.3 Output Com-

pare Functions for more information.

11.5.4 Pulse Accumulator Input Pin

The pulse accumulator input (PAI) pin connects a discrete signal to the pulse accumu-

lator for timed or gated pulse accumulation. PAI has hysteresis. Any pulse longer than

two system clocks is guaranteed to be valid and any pulse shorter than one system

clock is ignored. It can be used as a general-purpose input pin. Refer to 11.10 Pulse

Accumulator for more information.

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SPMCK16Z4MPV20 Datasheet(PDF) 271 Page - Freescale Semiconductor, Inc

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