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MFRC523 Datasheet(PDF) 31 Page - NXP Semiconductors

Part No. MFRC523
Description  Contactless reader IC
Download  98 Pages
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
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MFRC523 Datasheet(HTML) 31 Page - NXP Semiconductors

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MFRC523_33
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
PUBLIC
Rev. 3.3 — 5 March 2010
115233
31 of 98
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:
(5)
An example of calculating total delay time (td) is shown in Equation 6, where the
TPrescaler value = 4095 and TReloadVal = 65535:
(6)
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.
t
d
TPrescaler
2
1
+
×
()
TReloadVal
1
+
()
×
13.56 MHz
---------------------------------------------------------------------------------------------------------
=
39.59 s
4095
2
1
+
×
()
65535
1
+
()
×
13.56 MHz
-----------------------------------------------------------------------
=


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