SLRC400 Datasheet, PDF (80/130 Pages) NXP Semiconductors – I·CODE Reader IC

Philips Semiconductors
I•CODE Reader IC
Product Specification Rev. 2.0 November 2001
SL RC400
10.3 Stand By Mode
This mode is immediately entered by setting bit StandBy in the Control-Register. All internal current sinks are
switched off (including the internal digital clock buffer but except the oscillator buffer).
Different from the Hard Power Down Mode, the digital input buffers are not separated from the input pads but
keep their functionality. The digital output pins do not change their state.
Different from the Soft Power Down Mode, the oscillator does not need time to wake up.
After resetting bit StandBy in the Control-Register it needs 4 clocks on pin OSCIN until the Stand By Mode is
left. This is indicated by the StandBy bit itself. Resetting it does not immediately clear it, but it is cleared
automatically by the SL RC400 when the Stand By Mode is left.
10.4 Receiver Power Down
It is power saving to switch off the receiver circuit when it is not needed and switched it on again right before
data is to be received from the label. This is done automatically by setting bit RxAutoPD to 1. If it is set to 0
the receiver is continuously switched on.
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Preliminary