CLRC632 Datasheet, PDF (89/163 Pages) NXP Semiconductors – Multiple Protocol Contactless Reader IC

Philips Semiconductors
Product Specification Rev. 3.0; May 2003
Multiple Protocol Contactless Reader IC
CL RC632
9.2.4 STATUS OF THE TIMER UNIT
The TRunning bit in the SecondaryStatus Register shows the timer’s current status. Any configured start
event starts the timer at the TReloadValue and changes the status flag TRunning to 1, any configured stop
event stops the timer and sets the status flag TRunning back to 0. As long as status flag TRunning is set to
1, the TimerValue Register changes with the next timer unit clock.
The actual timer unit content can be read directly via the TimerValue Register.
9.2.5 TIMESLOTPERIOD
For sending of I•CODE1-Quit-Frames it is necessary to generat a exact chronological relation to the begin of
the command frame.
Is TimeSlotPeriod > 0, with the end of command transmission the TimeSlotPeriod starst.
If there are Data in the FIFO after reaching the end of TimeSlotPeriod, these data were sent at that moment.
If the FIFO is empty nothing happens.
As long as the contend of TimeSlotPeriod is > 0 the counter for the TimeSlotPeriod will start automatically
after reaching the end.
This allows a exact time relation to the end (as well as to the beginning) of the command frame for the
generation and sending of the I•CODE1-Quit-Frames
Is TimeSlotPeriod > 0 the next Frame starts exact with the interval
TimeSlotPeriod/CoderRate
delayed after each previous Send Frame. CoderRate defines the clock frequency of the coder.
If TimeSlotPeriod = 0, the send function will not be triggered automatically.
The content of the register TimeSlotPeriod can be changed during the active mode. The modification take
effect at the next restart of the TimeSlotPeriod.
89
Confidential