MFRC63002R datasheet(75/118 Pages) NXP

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MFRC630

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Product data sheet

COMPANY PUBLIC

Rev. 3.1 — 6 September 2012

227531

75 of 118

NXP Semiconductors

MFRC630

Contactless reader IC

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 100. T3Control bits

Bit

Symbol

Description

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.

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).

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.

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 101. T3ReloadHi register (address 1Fh);

Bit

Symbol

T3ReloadHi

Access

rights

r/w

Table 102. 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 103. T3ReloadLo register (address 20h)

Bit

Symbol

T3ReloadLo

Access

rights

r/w

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