CLRC63201T View Datasheet(PDF) - NXP Semiconductors.
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Description
MFG CO.
'CLRC63201T' PDF : 127 Pages View PDF
NXP Semiconductors
CLRC632
Standard multi-protocol reader solution
9.7.3 Initialization phase
The initialization phase automatically follows the reset phase and takes 128 clock cycles.
During the initializing phase the content of the EEPROM blocks 1 and 2 is copied into the
register subaddresses 10h to 2Fh (see Section 9.2.2 on page 13).
Remark: During the production test, the CLRC632 is initialized with default configuration
values. This reduces the microprocessor’s configuration time to a minimum.
9.7.4 Initializing the parallel interface type
A different initialization sequence is used for each microprocessor. This enables detection
of the correct microprocessor interface type and synchronization of the microprocessor’s
and the CLRC632’s start-up. See Section 9.1.3 on page 8 for detailed information on the
different connections for each microprocessor interface type.
During StartUp phase, the command value is set to 3Fh once the oscillator attains clock
frequency stability at an amplitude of > 90 % of the nominal 13.56 MHz clock frequency. At
the end of the initialization phase, the CLRC632 automatically switches to idle and the
command value changes to 00h.
To ensure correct detection of the microprocessor interface, the following sequence is
executed:
• the Command register is read until the 6-bit register value is 00h. On reading the 00h
value, the internal initialization phase is complete and the CLRC632 is ready to be
controlled
• write 80h to the Page register to initialize the microprocessor interface
• read the Command register. If it returns a value of 00h, the microprocessor interface
was successfully initialized
• write 00h to the Page registers to activate linear addressing mode.
9.8 Oscillator circuit
DEVICE
OSCOUT OSCIN
13.56 MHz
15 pF
15 pF
001aak614
Fig 11. Quartz clock connection
The clock applied to the CLRC632 acts as a time basis for the synchronous system
encoder and decoder. The stability of the clock frequency is an important factor for correct
operation. To obtain highest performance, clock jitter must be as small as possible. This is
best achieved by using the internal oscillator buffer with the recommended circuitry.
CLRC632
Product data sheet
COMPANY PUBLIC
All information provided in this document is subject to legal disclaimers.
Rev. 3.7 — 27 February 2014
073937
© NXP Semiconductors N.V. 2014. All rights reserved.
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