MFRC523 Просмотр технического описания (PDF) - NXP Semiconductors.

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MFRC523

Contactless Reader IC

NXP Semiconductors. 

NXP Semiconductors

MFRC523

Contactless reader IC

The timer can be started manually using the ControlReg register’s TStartNow bit and

stopped using the ControlReg register’s TStopNow bit.

The timer can also be activated automatically to meet any dedicated protocol

requirements, by setting the TModeReg register’s TAuto bit to logic 1.

The delay time of a timer stage is set by the reload value + 1. The total delay time (td) is

calculated using Equation 5:

td

=

(---T----P----r--e---s---c---a---l--e---r----×-----2-----+----1----)---×-----(---T---R----e---l--o----a---d---V----a----l---+-----1---)-

13.56 MHz

(5)

An example of calculating total delay time (td) is shown in Equation 6, where the

TPrescaler value = 4095 and TReloadVal = 65535:

39.59 s = (---4---0---9---5----×-----2-----+-----1---)----×----(---6---5---5---3---5----+-----1----)

(6)

13.56 MHz

Example: To give a delay time of 25 μs requires 339 clock cycles to be counted and a

TPrescaler value of 169. This configures the timer to count up to 65535 time-slots for

every 25 μs period.

MFRC523_33

Product data sheet

PUBLIC

All information provided in this document is subject to legal disclaimers.

Rev. 3.3 — 5 March 2010

115233

© NXP B.V. 2010. All rights reserved.

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