SLRC400 Datasheet, PDF (82/130 Pages) NXP Semiconductors – I·CODE Reader IC

Philips Semiconductors
I•CODE Reader IC
Product Specification Rev. 2.0 November 2001
SL RC400
11.4 Initialising the Parallel Interface-Type
For the different connections for the different µ-Processor interface types (see 4.3), a certain initialising
sequence shall be applied to enable a proper µ-Processor interface type detection and to synchronise the
µ-Processor’s and the SL RC400’s Start Up.
During the whole Start Up Phase, the Command value reads as 3F_hex. At the end of the Initialising Phase the
SL RC400 enters the Idle Command automatically. Consequently the Command value changes to 00_hex.
To ensure proper detection of the µ-Processor interface, the following sequence shall be executed:
• Read from the Command-Register until the six bit register value for Command is 00_hex.
The internal initialisation phase is now completed and the SL RC400 is ready to be controlled.
• Write the value 80_hex to the Page-Register to initialise the µ-Processor interface.
• Read the Command-Register. If its value is 00_hex the µ-Processor interface initialisation was
successful.
After interface initialisation, the linear addressing mode can be activated by writing 0x00 to the page
register(s).
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Preliminary