参数资料
型号: CLRC63201T
厂商: NXP Semiconductors N.V.
元件分类: 通信及网络
英文描述: Multiple protocol contactless reader IC (MIFARE-I-CODE1)
封装: CLRC63201T/0FE<SOT287-1 (SO32)|<<http://www.nxp.com/packages/SOT287-1.html<1<week 5, 2005,;
文件页数: 44/126页
文件大小: 719K
代理商: CLRC63201T
CLRC632_35
NXP B.V. 2009. All rights reserved.
Product data sheet
PUBLIC
Rev. 3.5 — 10 November 2009
073935
24 of 126
NXP Semiconductors
CLRC632
Multiple protocol contactless reader IC (MIFARE/I-CODE1)
9.5.1 Timer unit implementation
9.5.1.1
Timer unit block diagram
Figure 8 shows the block diagram of the timer module.
The timer unit is designed, so that events when combined with enabling ags start or stop
the counter. For example, setting bit TStartTxBegin = logic 1 enables control of received
data with the timer unit. In addition, the rst received bit is indicated by the TxBegin event.
This combination starts the counter at the dened TReloadValue[7:0].
The timer stops automatically when the counter value is equal to zero or if a dened stop
event happens.
9.5.1.2
Controlling the timer unit
The main part of the timer unit is a down-counter. As long as the down-counter value is
not zero, it decrements its value with each timer clock cycle.
If the TAutoRestart ag is enabled, the timer does not decrement down to zero. On
reaching value 1, the timer reloads the next clock function with the TReloadValue[7:0].
Fig 8.
Timer module block diagram
001aak611
TxEnd Event
TAutoRestart
TRunning
TStartTxEnd
TStartNow
S
R
Q
START COUNTER/
PARALLEL LOAD
STOP COUNTER
TPreScaler[4:0]
TimerValue[7:0]
Counter = 0 ?
to interrupt logic: TimerIRq
PARALLEL OUT
PARALLEL IN
TReloadValue[7:0]
CLOCK
DIVIDER
COUNTER MODULE
(x
≤ x 1)
TStopNow
TxBegin Event
TStartTxBegin
TStopRxEnd
RxEnd Event
TStopRxBegin
13.56 MHz
to parallel interface
RxBegin Event
Q
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