MFRC63002R datasheet(69/118 Pages) NXP

69 / 118 page

MFRC630

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Product data sheet

COMPANY PUBLIC

Rev. 3.1 — 6 September 2012

227531

69 of 118

NXP Semiconductors

MFRC630

Contactless reader IC

9.7.2.1

T0ReloadHi

High byte reload value of the Timer0.

9.7.2.2

T0ReloadLo

Low byte reload value of the Timer0.

Table 70.

T0Control bits

Bit

Symbol

Description

T0StopRx

If set, the timer stops immediately after receiving the first 4 bits. If

cleared the timer does not stop automatically.

Note: If LFO Trimming is selected by T0Start, this bit has no effect.

RFU

5 to 4

T0Start

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)

T0AutoRestart 1: the timer automatically restarts its count-down from T0ReloadValue,

after the counter value has reached the value zero.

0: the timer decrements to zero and stops.

The bit Timer1Irq is set to logic 1 when the timer underflows.

RFU

1 to 0

T0Clk

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 Timer2.

11b: The timer input clock is an underflow of Timer1.

Table 71.

T0ReloadHi register (address 10h);

Bit

Symbol

T0Reload Hi

Access

rights

r/w

Table 72.

T0ReloadHi bits

Bit

Symbol

Description

7 to 0

T0ReloadHi

Defines the high byte of the reload value of the timer. With the start

event the timer loads the value of the registers T0ReloadValHi,

T0ReloadValLo. Changing this register affects the timer only at the

next start event.

Table 73.

T0ReloadLo register (address 11h);

Bit

Symbol

T0ReloadLo

Access

rights

r/w

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