SLRC400 Datasheet, PDF (72/130 Pages) NXP Semiconductors – I·CODE Reader IC

Philips Semiconductors
I•CODE Reader IC
Product Specification Rev. 2.0 November 2001
SL RC400
9 TIMER UNIT
9.1 Overview
A timer is implemented in the SL RC400. 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. 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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Preliminary