SLRC400 datasheet(59/101 Pages) NXP

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SLRC400_33

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Product data sheet

PUBLIC

Rev. 3.3 — 23 March 2010

054333

59 of 101

NXP Semiconductors

SLRC400

ICODE reader IC

9.5.6.4 TimerControl register

Selects start and stop conditions for the timer.

9.5.6.5 TimerReload register

Defines the preset value for the timer.

Table 104. TimerClock register (address: 2Ah) reset value: 0000 1011b, 0Bh bit allocation

Bit

Symbol

TAutoRestart

TPreScaler[4:0]

Access

R/W

Table 105. TimerClock register bit descriptions

Bit

Symbol

Value

Function

7 to 6

these values must not be changed

TAutoRestart

the timer automatically restarts its countdown from the

TReloadValue[7:0] instead of counting down to zero

the timer decrements to zero and register InterruptRq

TimerIRq bit is set to logic 1

4 to 0

TPreScaler[4:0] -

defines the timer clock frequency (fTimerClock). The

TPreScaler[4:0] can be adjusted from 0 to 15. The following

formula is used to calculate the TimerClock frequency

(fTimerClock):

fTimerClock = 13.56 MHz / 2TPreScaler [MHz]

Table 106. TimerControl register (address: 2Bh) reset value: 0000 0010b, 02h bit allocation

Bit

Symbol

TStopRxEnd

TStopRxBegin

TStartTxEnd TStartTxBegin

Access

R/W

Table 107. TimerControl register bit descriptions

Bit

Symbol

Value Description

7 to 4 0000

these values must not be changed

TStopRxEnd

the timer automatically stops when data reception ends

the timer is not influenced by this condition

TStopRxBegin

the timer automatically stops when the first valid bit is received

the timer is not influenced by this condition

TStartTxEnd

the timer automatically starts when data transmission ends. If

the timer is already running, the timer restarts by loading

TReloadValue[7:0] into the timer.

the timer is not influenced by this condition

TStartTxBegin

the timer automatically starts when the first bit is transmitted. If

the timer is already running, the timer restarts by loading

TReloadValue[7:0] into the timer.

the timer is not influenced by this condition

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