Analog Devices VisualDSP++ 5.0 Service Manual page 44

System Services Overview
the application to access and control the programmable flags
through a clean and consistent interface. The programmable flag
service allows the application to:
• Configure the direction, either input or output, of any flag.
• Set, clear, and toggle the value of all output flags.
• Sense the value of input flags.
• Install callbacks, including live and deferred callbacks when
specific trigger conditions occur on a flag.
• Timer Service – The timer service provides applications, drivers,
and a simple mechanism to control general-purpose, core, and
watchdog timers of the Blackfin processor. The timer service allows
the application to:
• Configure and control any timer within the processor,
including general-purpose, core, and watchdog timers.
• Install callbacks, including both "live" and deferred
callbacks, when timers expire or trigger.
• Port Control Service – (available only on the ADSP-BF534,
ADSP-BF536, and ADSP-BF537 processors) The port control
service configures the pin muxing hardware appropriately to ensure
proper operation of the peripherals that share common input and
output pins. All system services and device drivers automatically
make the appropriate calls into the port control service to seam-
lessly configure the pin muxing hardware without any end-user or
application interaction, other than initialization of the service.
1-6 VisualDSP++ 5.0 Device Drivers and System
Services Manual for Blackfin Processors