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CLRC663 Datasheet(PDF) 77 Page - NXP Semiconductors |
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CLRC663 Datasheet(HTML) 77 Page - NXP Semiconductors |
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77 / 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 77 of 132 NXP Semiconductors CLRC663 Contactless reader IC 9.7.2.6 T1ReloadHi High byte (MSB) reload value of the Timer1. 9.7.2.7 T1ReloadLo Low byte (LSB) reload value of the Timer1. Table 88. T1Control bits Bit Symbol Description 7 T1StopRx If set, the timer stops after receiving the first 4 bits. If cleared, the timer is not stopped automatically. Note: If LFO trimming is selected by T1start, this bit has no effect 6- RFU 5 to 4 T1Start 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 T1AutoRestart Set to logic 1, the timer automatically restarts its countdown from T1ReloadValue, after the counter value has reached the value zero. Set to logic 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 T1Clk 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 Timer0 11b: The timer input clock is an underflow of Timer2 Table 89. T0ReloadHi register (address 15h) Bit 7 6 5 4 3 2 1 0 Symbol T1ReloadHi Access rights r/w Table 90. T1ReloadHi bits Bit Symbol Description 7 to 0 T1ReloadHi Defines the high byte reload value of the Timer 1. With the start event the timer loads the value of the T1ReloadValHi and T1ReloadValLo. Changing this register affects the Timer only at the next start event. Table 91. T1ReloadLo register (address 16h) Bit 7 6 5 4 3 2 1 0 Symbol T1ReloadLo Access rights r/w |
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