CIRCC datasheet(36/70 Pages) SMSC

36 / 70 page

The No Care Data Code (NCDC) bit determines

the behavior of the CIR decoder when both the

Frame and the PME Wake bits are active (one)

(Table 24). When the NCDC bit is one, a PME

event may be generated regardless of the data

programmed in the 8 bit Data Code register,

pending NCCC qualification.

This enables a

wake-up event on any key press.

When the

NCDC bit is zero (default), a PME event can only

be generated if the data code field in the

received NEC CIR frame matches the value

programmed in the 8 bit Data Code register;

NCCC qualification may also apply.

This

enables a wake-up event for a particular key-

press. Note: The NCDC bit has no effect if either

the Frame bit or the PME Wake bit is inactive

(zero).

TABLE 24 - NCCC AND NCDC FUNCTIONALITY

FRAME

NCCC

NCDC

PME

WAKE

FUNCTION

No CIR Hardware Framing or Wake-up Events.

The data code field of incoming frame is written to the

FIFO if the custom code field of incoming NEC CIR frame

matches the value of the 16 bit Custom Code register.

PME signal is asserted if the custom code and the data

code fields of incoming NEC CIR frame match the values

programmed in the 16 bit Custom Code and 8 bit Data

Code registers.

PME signal is asserted if the custom code field of

incoming

NEC

CIR

frame

matches

the

value

programmed in the 16 bit Custom Code register,

regardless of the data that is programmed in the 8-bit

Data Code register.

The custom code and the data code fields of any valid

NEC CIR frame are written to the FIFO.

PME signal is asserted if the data code field of an

incoming NEC CIR frame matches the value of the 8 bit

Data Code register.

PME asserted upon receipt of any valid NEC CIR frame.

CIRCC Datasheet(PDF) 36 Page - SMSC Corporation

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