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| 型號(hào)： | MFRC53101T |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | ISO-IEC 14443 reader IC |
| 封裝： | MFRC53101T/0FE<SOT287-1 (SO32)|<<http://www.nxp.com/packages/SOT287-1.html<1<week 51, 2004,;MFRC53101T/0FE<SOT287-1 (SO32)|<<http://www.nxp.com/packages/SOT287-1.html< |
| 文件頁數(shù)： | 25/116頁 |
| 文件大?。?/td> | 862K |
| 代理商： | MFRC53101T |
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MFRC531_34
NXP B.V. 2010. All rights reserved.
Product data sheet
PUBLIC
Rev. 3.4 — 26 January 2010
056634
25 of 116
NXP Semiconductors
MFRC531
ISO/IEC 14443 reader IC
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
(t
Timer
).
9.5.2.2
Stopwatch
The time (t
Timer
) 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 defined 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 specified by t
Timer
.
Periodic trigger:
If the microprocessor sets the TAutoRestart bit, it generates an interrupt
request after every t
Timer
cycle.
9.5.3
Timer unit registers
Table 22
shows the related flags of the timer unit in alphabetical order.
Table 22.
Flags
TAutoRestart
TimerValue[7:0]
Δ
t
TReLoad
value
TimerValue
–
(
)
t
Timer
×
=
Associated timer unit registers and flags
Register name
TimerClock
TimerValue
Bit
5
7 to 0
Register address
2Ah
0Ch
TReloadValue[7:0]
TPreScaler[4:0]
TRunning
TStartNow
TStartTxBegin
TStartTxEnd
TStopNow
TStopRxBegin
TStopRxEnd
TimerReload
TimerClock
SecondaryStatus
Control
TimerControl
TimerControl
Control
TimerControl
TimerControl
7 to 0
4 to 0
7
1
0
1
2
2
3
2Ch
2Ah
05h
09h
2Bh
2Bh
09h
2Bh
2Bh
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