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CLRC663 Datasheet(PDF) 83 Page - NXP Semiconductors |
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CLRC663 Datasheet(HTML) 83 Page - NXP Semiconductors |
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83 / 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 83 of 132 NXP Semiconductors CLRC663 Contactless reader IC 9.7.2.21 T4ReloadHi High byte of the reload value of the 16-bit timer 4. 9.7.2.22 T4ReloadLo Low byte of the reload value of the 16-bit timer 4. Table 118. T4Control bits Bit Symbol Description 7 T4Running Shows if the timer T4 is running. If the bit T4StartStopNow is set, this bit and the timer T4 can be started/stopped. 6T4Start StopNow if set, the bit T4Running can be changed 5 T4AutoTrimm If set to one, the timer activates an LPO trimming procedure when it underflows. For the T4AutoTrimm function, at least one timer (T0 to T3) has to be configured properly for trimming (T3 is not allowed if T4AutoLPCD is set in parallel). 4 T4AutoLPCD If set to one, the timer activates a low-power card detection sequence. If a card is detected an interrupt request is raised and the system remains active if enabled. If no card is detected the CLRC663 enters the Power down mode if enabled. The timer is automatically restarted (no gap). Timer 3 is used to specify the time where the RF field is enabled to check if a card is present. Therefor you may not use Timer 3 for T4AutoTrimm in parallel. 3 T4AutoRestart Set to logic 1, the timer automatically restarts its countdown from T4ReloadValue, after the counter value has reached the value zero. Set to logic 0 the timer decrements to zero and stops. The bit Timer4Irq is set to logic 1 at timer underflow. 2 T4AutoWakeUp If set, the CLRC663 wakes up automatically, when the timer T4 has an underflow. This bit has to be set if the IC should enter the Power down mode after T4AutoTrimm and/or T4AutoLPCD is finished and no card has been detected. If the IC should stay active after one of these procedures this bit has to be set to 0. 1 to 0 T4Clk 00b - the timer input clock is the LFO clock 01b - the timer input clock is the LFO clock/8 10b - the timer input clock is the LFO clock/16 11b - the timer input clock is the LFO clock/32 Table 119. T4ReloadHi register (address 24h) Bit 7 6 5 4 3 2 1 0 Symbol T4ReloadHi Access rights r/w Table 120. T4ReloadHi bits Bit Symbol Description 7 to 0 T4ReloadHi Defines high byte of the for the reload value of timer 4. With the start event the timer 4 loads the T4ReloadVal. Changing this register affects the timer only at the next start event |
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