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CLRC663 Datasheet(PDF) 75 Page - NXP Semiconductors |
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CLRC663 Datasheet(HTML) 75 Page - NXP Semiconductors |
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75 / 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 75 of 132 NXP Semiconductors CLRC663 Contactless reader IC 9.7.2.1 T0ReloadHi High byte reload value of the Timer0. 9.7.2.2 T0ReloadLo Low byte reload value of the Timer0. Table 78. T0Control bits Bit Symbol Description 7 T0StopRx If set, the timer stops immediately after receiving the first 4 bits. If cleared the timer does not stop automatically. Note: If LFO Trimming is selected by T0Start, this bit has no effect 6- RFU 5 to 4 T0Start 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 T0AutoRestart 1: the timer automatically restarts its count-down from T0ReloadValue, after the counter value has reached the value zero. 0: the timer decrements to zero and stops. The bit Timer1Irq is set to logic 1 when the timer underflows. 2- RFU 1 to 0 T0Clk 00b: The timer input clock is 13.56 MHz. 01b: The timer input clock is 211,875 kHz. 10b: The timer input clock is an underflow of Timer2. 11b: The timer input clock is an underflow of Timer1. Table 79. T0ReloadHi register (address 10h); Bit 7 6 5 4 3 2 1 0 Symbol T0Reload Hi Access rights r/w Table 80. T0ReloadHi bits Bit Symbol Description 7 to 0 T0ReloadHi Defines the high byte of the reload value of the timer. With the start event the timer loads the value of the registers T0ReloadValHi, T0ReloadValLo. Changing this register affects the timer only at the next start event. Table 81. T0ReloadLo register (address 11h); Bit 7 6 5 4 3 2 1 0 Symbol T0ReloadLo Access rights r/w |
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