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參數資料
| 型號： | CLRC632 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Multiple Protocol Contactless Reader IC |
| 中文描述： | 多協(xié)議非接觸式讀卡器IC |
| 文件頁數： | 88/163頁 |
| 文件大小： | 948K |
| 代理商： | CLRC632 |
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Philips Semiconductors
Product Specification Rev. 3.0; May 2003
Multiple Protocol Contactless Reader IC
CL RC632
88
Confidential
9.2.2
CONTROLLING THE TIMER UNIT
The main part of the timer unit is a down-counter. As long as the down-counter value is unequal zero, it
decrements its value with each timer clock.
If
TAutoRestart
is enabled the timer does not decrement down to zero. Having reached the value 1 the timer
reloads with the next clock with the
TimerReload
value.
The timer is started immediately by loading a value from the
TimerReload Register
into the counter module.
This may be triggered by one of the following events:
Transmission of the first bit to the card (TxBegin Event) and bit
TStartTxBegin
is 1
Transmission of the last bit to the card (TxEnd Event) and bit
TStartTxEnd
is 1
Bit
TStartNow
is set to 1 (by the μ-Processor)
Note: Every start event reloads the timer from the
TimerReload Register
. Thus, the timer unit is re-triggered.
The timer can be configured to stop with one of the following events:
Reception of the first valid bit from the card (RxBegin Event) and bit
TStopRxBegin
is set to 1
Reception of the last bit from the card (RxEnd event) and bit
TStopRxEnd
is set to 1
The counter module has decrement down to zero and bit
TAutoRestart
is set to 0
Bit
TStopNow
is set to 1 (by the μ-Processor)
Loading a new value, e.g. zero, into the
TimerReload
Register does not immediately influence the counter,
since the
TimerReload
Register affects the counter units content only with the next start event. Thus, the
TimerReload
Register
may be changed even if the timer unit is already counting. The consequence of
changing the
TimerReload
Register will be visible after the next start event.
If the counter is stopped by setting bit
TstopNow,
no
TimerIRq
is signalled.
9.2.3
TIMER UNIT CLOCK AND PERIOD
The clock of the timer unit is derived from the 13.56 MHz chip clock via a programmable divider. The clock
selection is done with the
TPreScaler
Register that defines the timer unit clock frequency according to the
following formula:
MHz
f
T
eScaler
T
TimerClock
TimerClock
56
.
13
2
1
Pr
=
=
The possible values for the
TPreScaler
Register range from 0 up to 21 resulting in minimum time T
TimerClock
of
about 74 ns up to about 150 ms.
The time period elapsed since the last start event is calculated with
TimerClock
Timer
T
f
TimerValue
ue
TReLoadVal
=
resulting in a minimum time T
Timer
of about 74 ns up to about 40 s.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| CLRC63201T/0FE | 制造商:NXP Semiconductors 功能描述: |
| CLRC63201T/0FE,112 | 功能描述:RFID應答器 I.CODE HS READER RoHS:否 制造商:Murata 存儲容量:512 bit 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體: 封裝:Reel |
| CLRC63201T/0FE,118 | 制造商:NXP Semiconductors 功能描述:Interface Misc |
| CLRC63201T/0FE112 | 制造商:NXP Semiconductors 功能描述:CNTCLESS RC 5V ISO14443 + ISO15693 |
| CLRC663 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Contactless reader IC |
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