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MFRC522 Scheda tecnica(PDF) 30 Page - NXP Semiconductors

Il numero della parte MFRC522
Spiegazioni elettronici  Contactless reader IC
PDF  96 Pages
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Produttore elettronici  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo NXP - NXP Semiconductors

MFRC522 Scheda tecnica(HTML) 30 Page - NXP Semiconductors

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MFRC522_33
© NXP B.V. 2009. All rights reserved.
Product data sheet
PUBLIC
Rev. 3 — 26 October 2009
112133
30 of 96
NXP Semiconductors
MFRC522
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 time delay of a timer stage is calculated with Equation 5 adding 1 to the reload values
below:
• TPrescaler reload value = 4095
• TReloadVal reload value = 65535
(5)
Example: To indicate 100
µs, 678 clock cycles must be counted, so the TPrescaler value
must be set to 677 using register TModeReg bits TPrescaler_Hi[3:0] and TPrescalerReg
bits TPrescaler_Lo[7:0]. This gives the timer an input clock of 100
µs that enables it to
count up to 65535 time slots for each 100
µs.
Maximum time
4096
65536
6.78 MHz
-------------------------
×
39.59 s
==



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