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CLRC63201T/0FE Datasheet(PDF) 87 Page - NXP Semiconductors

Part # CLRC63201T/0FE
Description  Multiple Protocol Contactless Reader IC
PDF  163 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

CLRC63201T/0FE Datasheet(HTML) 87 Page - NXP Semiconductors

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Philips Semiconductors
Product Specification Rev. 3.0; May 2003
Multiple Protocol Contactless Reader IC
CL RC632
87
Confidential
9.2
Implementation of the Timer Unit
9.2.1
BLOCK DIAGRAM
The following block diagram shows the timer module.
The timer unit is designed in a way, that several events in combination with enabling flags start or stop the
counter. For example, setting the bit TStartTxBegin to 1 enables to control the receiving of data using the
timer unit. In addition, the first received bit is indicated by TxBeginEvent. This combination starts the counter
at the defined TReloadValue.
The timer stops either automatically if the counter value is equal to zero, or if a defined stop event happens.
Counter Module
(x <= x-1)
start counter /
parallel load
stop counter
>clock
Clock
Divider
13.56 MHz
TPreScaler [4:0]
TReloadValue [7:0]
TStopNow
RxEnd Event
TAutoRestart
TStopRxEnd
RxBegin Event
TStopRxBegin
TStartNow
TxEnd Event
TStartTxEnd
TxBegin Event
TStartTxBegin
TimerValue [7:0]
parallel in
parallel out
Counter = 0 ?
to Interrupt Logic: TimerIRq
to Parallel Interface
S
R
Q
Q
TRunning
Figure 9-1: Timer Module Block Diagram



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