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 77 of 120
NXP Semiconductors
MFRC631
High performance ISO/IEC 14443 A/B reader solution
9.7.2.16 T3ReloadHi
High byte of the reload value of Timer3.
9.7.2.17 T3ReloadLo
Low byte of the reload value of Timer3.
Table 102. T3Control bits
Bit Symbol Description
7 T3StopRx 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 T3Start, this bit has no effect.
6- RFU
5 to 4 T3Start 00b - timer is not started automatically
01b - 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 T3AutoRestart Set to logic 1, the timer automatically restarts its countdown from
T3ReloadValue, 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 T3Clk 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 Timer1
Table 103. T3ReloadHi register (address 1Fh);
Bit 7 6 5 4 3 2 1 0
Symbol T3ReloadHi
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Table 104. T3ReloadHi bits
Bit Symbol Description
7 to 0 T3ReloadHi Defines the high byte of the reload value of the Timer3. With the start
event the timer load the value of the T3ReloadValHi and
T3ReloadValLo. Changing this register affects the timer only at the
next start event.
Table 105. T3ReloadLo register (address 20h)
Bit 7 6 5 4 3 2 1 0
Symbol T3ReloadLo
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