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: 47/126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
27 of 126
NXP Semiconductors
CLRC632
Multiple protocol contactless reader IC (MIFARE/I-CODE1)
9.5.2 Using the timer unit functions
9.5.2.1
Time-out and WatchDog counters
After starting the timer using TReloadValue[7:0], the timer unit decrements the
TimerValue register beginning with a given start event. If a given stop event occurs, such
as a bit being received from the card, the timer unit stops without generating an interrupt.
If a stop event does not occur, such as the card not answering within the expected time,
the timer unit decrements down to zero and generates a timer interrupt request. This
signals to the microprocessor the expected event has not occurred within the given time
(tTimer).
9.5.2.2
Stopwatch
The time (tTimer) between a start and stop event is measured by the microprocessor using
the timer unit. Setting the TReloadValue register triggers the timer which in turn, starts to
decrement. If the dened stop event occurs, the timer stops. The time between start and
stop is calculated by the microprocessor using Equation 5, when the timer does not
decrement down to zero.
(5)
9.5.2.3
Programmable one shot timer and periodic trigger
Programmable one shot timer: The microprocessor starts the timer unit and waits for
the timer interrupt. The interrupt occurs after the time specied by tTimer.
Periodic trigger: If the microprocessor sets the TAutoRestart bit, it generates an interrupt
request after every tTimer cycle.
9.5.3 Timer unit registers
Table 24 shows the related ags of the timer unit in alphabetical order.
t
TReLoad
value
TimerValue
() t
Timer
×
=
Table 24.
Associated timer unit registers and ags
Flags
Register name
Bit
Register address
TAutoRestart
TimerClock
5
2Ah
TimerValue[7:0]
TimerValue
7 to 0
0Ch
TReloadValue[7:0]
TimerReload
7 to 0
2Ch
TPreScaler[4:0]
TimerClock
4 to 0
2Ah
TRunning
SecondaryStatus
7
05h
TStartNow
Control
1
09h
TStartTxBegin
TimerControl
0
2Bh
TStartTxEnd
TimerControl
1
2Bh
TStopNow
Control
2
09h
TStopRxBegin
TimerControl
2
2Bh
TStopRxEnd
TimerControl
3
2Bh
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CLRC63201T/0FE 制造商:NXP Semiconductors 功能描述:
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