Product data

MFRC631 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2014. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.3 — 4 February 2014
227433 75 of 120
NXP Semiconductors
MFRC631
High performance ISO/IEC 14443 A/B reader solution
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 92. 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 93. T2ReloadHi register (address 1Ah)
Bit 7 6 5 4 3 2 1 0
Symbol T2ReloadHi
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Table 94. 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 95. T2ReloadLo register (address 1Bh)
Bit 7 6 5 4 3 2 1 0
Symbol T2ReloadLo
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