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CLRC663 Datasheet(PDF) 79 Page - NXP Semiconductors |
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CLRC663 Datasheet(HTML) 79 Page - NXP Semiconductors |
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79 / 132 page  CLRC663 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet COMPANY PUBLIC Rev. 3.3 — 3 April 2012 171133 79 of 132 NXP Semiconductors CLRC663 Contactless reader IC 9.7.2.11 T2ReloadHi High byte of the reload value of Timer2. 9.7.2.12 T2ReloadLo Low byte of the reload value of Timer2. Table 98. T2Control bits Bit Symbol Description 7 T2StopRx If set the timer stops immediately after receiving the first 4 bits. If cleared indicates, that the timer is not stopped automatically. Note: If LFO Trimming is selected by T2Start, this bit has no effect 6- RFU 5 to 4 T2Start 00b: The timer is not started automatically. 01b: The timer starts automatically at the end of the transmission. 10b: Timer is used for LFO trimming without underflow (Start/Stop on PosEdge). 11b: Timer is used for LFO trimming with underflow (Start/Stop on PosEdge). 3 T2AutoRestart Set to logic 1, the timer automatically restarts its countdown from T2ReloadValue, after the counter value has reached the value zero. Set to logic 0 the timer decrements to zero and stops. The bit Timer2IRq is set to logic 1 when the timer underflows 2- RFU 1 to 0 T2Clk 00b: The timer input clock is 13.56 MHz. 01b: The timer input clock is 212 kHz. 10b: The timer input clock is an underflow of Timer0 11b: The timer input clock is an underflow of Timer1 Table 99. T2ReloadHi register (address 1Ah) Bit 7 6 5 4 3 2 1 0 Symbol T2ReloadHi Access rights r/w Table 100. T2Reload bits Bit Symbol Description 7 to 0 T2ReloadHi Defines the high byte of the reload value of the Timer2. With the start event the timer load the value of the T2ReloadValHi and T2ReloadValLo. Changing this register affects the timer only at the next start event. Table 101. T2ReloadLo register (address 1Bh) Bit 7 6 5 4 3 2 1 0 Symbol T2ReloadLo Access rights r/w |
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