SLRC400 datasheet(18/130 Pages) PHILIPS

18 / 130 page

Philips Semiconductors

Product Specification Rev. 2.0 November 2001

•CODE Reader IC

SL RC400

Preliminary

5.1.1

Bits and flags for different registers behave differently, depending on their functions. In principle bits with

same behaviour are grouped in common registers.

Abbreviation

Behaviour

Description

r/w

read and

write

These bits can be written and read by the µ-Processor. Since they are used

only for control means, there content is not influenced by internal state

machines, e.g. the TimerReload-Register may be written and read by the µ-

Processor. It will also be read by internal state machines, but never changed by

them.

dynamic

These bits can be written and read by the µ-Processor. Nevertheless, they may

also be written automatically by internal state machines, e.g. the Command-

command.

read only

These registers hold flags, which value is determined by internal states only,

e.g. the ErrorFlag-Register can not be written from external but shows internal

states.

write only

These registers are used for control means only. They may be written by the µ-

Processor but can not be read. Reading these registers returns an undefined

value, e.g. the TestAnaSelect-Register is used to determine the signal on pin

AUX, but it is not possible to read its content.

Table 5-2: Behaviour of Register Bits and its Designation

SLRC400 Datasheet(PDF) 18 Page - NXP Semiconductors