User`s manual

PK2200 System Development s 37
The following points summarize the counters capabilities:
 The counter can measure the time at which a negative edge occurs
with a precision of a few microseconds. A minimum time must
occur between successive events to allow for interrupt processing.
 The counter can measure the width of a pulse by counting (up to
65,536) at a rate that varies from 300 Hz to 600 kHz, providing
16-bit accuracy.
 Count negative-going edges for up to two channels. The maxi-
mum count for high-speed counting (5 kHz and up) is 65,536. For
low speeds, the maximum count is unlimited.
Function calls load the count-down value for the DMA channel and
enable the DMA interrupt. Once a counter reaches zero, flags for the
DMA channel are set to 1. DMA flags can be monitored by an applica-
tion program.
Digital Outputs
Using the Digital Outputs
The digital outputs are supported in software by Dynamic C functions and
virtual driver variables. There are several methods for writing to the
digital outputs.
The digital outputs can be used for a wide variety of applications includ-
ing the following:
 Driving solenoids, relays, motors and other inductive loads
directly.
 Driving incandescent lamps, LEDs and resistive loads directly.
 Driving FETs, transistors, thyristors or solid state relays to
increase the current or voltage output capability as well as
providing a.c. drive capability.