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參數(shù)資料
| 型號(hào)： | MFRC50001T |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | Highly integrated ISO-IEC 14443 A reader IC |
| 封裝： | MFRC50001T/0FE<SOT287-1 (SO32)|<<http://www.nxp.com/packages/SOT287-1.html<1<week 15, 2005,; |
| 文件頁數(shù)： | 22/110頁 |
| 文件大小： | 841K |
| 代理商： | MFRC50001T |
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MFRC500_33
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
PUBLIC
Rev. 3.3 — 15 March 2010
048033
22 of 110
NXP Semiconductors
MFRC500
Highly Integrated ISO/IEC 14443 A 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 time 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.
Δ
t
TReLoad
value
TimerValue
–
(
)
t
Timer
×
=
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| MFRC50001T/0FE,112 | 功能描述:RFID應(yīng)答器 MIFARE READER RoHS:否 制造商:Murata 存儲(chǔ)容量:512 bit 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體: 封裝:Reel |
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| MFRC522_10 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Contactless reader IC |
| MFRC52201HN1 | 功能描述:RFID應(yīng)答器 CL READER IC’S RoHS:否 制造商:Murata 存儲(chǔ)容量:512 bit 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體: 封裝:Reel |
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