MFRC63002R datasheet(73/118 Pages) NXP

73 / 118 page

MFRC630

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Product data sheet

COMPANY PUBLIC

Rev. 3.1 — 6 September 2012

227531

73 of 118

NXP Semiconductors

MFRC630

Contactless reader IC

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 90.

T2Control bits

Bit

Symbol

Description

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.

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).

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

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 91.

T2ReloadHi register (address 1Ah)

Bit

Symbol

T2ReloadHi

Access

rights

r/w

Table 92.

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 93.

T2ReloadLo register (address 1Bh)

Bit

Symbol

T2ReloadLo

Access

rights

r/w

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