MFRC53001TSLASH0FE datasheet(21/116 Pages) PHILIPS

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MFRC530_33

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Product data sheet

PUBLIC

Rev. 3.3 — 6 July 2010

057433

21 of 115

NXP Semiconductors

MFRC530

ISO/IEC 14443 A Reader IC

9.5 Timer unit

The timer derives its clock from the 13.56 MHz on-board chip clock. The microprocessor

can use this timer to manage timing-relevant tasks.

The timer unit may be used in one of the following configurations:

• Timeout counter

• WatchDog counter

• Stopwatch

• 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 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 reception process). Several timer related flags can be set and these flags can be used

to generate an interrupt.

9.5.1 Timer unit implementation

9.5.1.1

Timer unit block diagram

Figure 8 shows the block diagram of the timer module.

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