CLRC63201TSLASH0FE datasheet(87/163 Pages) PHILIPS

87 / 163 page

Philips Semiconductors

Product Specification Rev. 3.0; May 2003

Multiple Protocol Contactless Reader IC

CL RC632

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

TRunning

Figure 9-1: Timer Module Block Diagram

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