mfrc531 NXP Semiconductors, mfrc531 Datasheet - Page 22

• Manufacturer Part Number: mfrc531
• Description: Iso/iec 14443 Reader Ic
• Manufacturer: NXP Semiconductors

NXP Semiconductors
MFRC531_34
Product data sheet
PUBLIC
9.5 Timer unit
The timer derives its clock signal from the 13.56 MHz on-board chip clock. The
microprocessor can use this timer to manage timing-relevant tasks.
The timer unit can be used in one of the following configurations:
The timer unit can be used to measure the time interval between two events or to indicate
that a specific timed event occurred. The timer is triggered by events but does not
influence any event (e.g. a time-out during data receiving does not automatically influence
the receiving process). Several timer related flags can be set and these flags can be used
to generate an interrupt.
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Timeout counter
WatchDog counter
Stopwatch
Programmable one shot
Periodical trigger
Rev. 3.4 — 26 January 2010
056634
ISO/IEC 14443 reader IC
MFRC531
© NXP B.V. 2010. All rights reserved.
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