CLRC632 Datasheet, PDF (86/163 Pages) NXP Semiconductors – Multiple Protocol Contactless Reader IC

Philips Semiconductors
Multiple Protocol Contactless Reader IC
Product Specification Rev. 3.0; May 2003
CL RC632
9 TIMER UNIT
9.1 Overview
A timer is implemented in the CL RC632. It derives its clock from the 13.56 MHz chip-clock. The µ-Processor
may use this timer to manage timing relevant tasks.
The timer unit may be used in one of the following configurations:
• Timeout-Counter
• Watch-Dog Counter
• Stop Watch
• Programmable One-Shot
• Periodical Trigger
The timer unit can be used to measure the time interval between two events or to indicate that a specific
event occurred after a specific time. The timer can be triggered by events which will be explained in the
following, but the timer itself does not influence any internal event (e.g. A timeout during data receiving does
not influence the receiving process automatically). Furthermore, several timer related flags are set and these
flags can be used to generate an interrupt.
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