STFPC320 datasheet(19/78 Pages) STMICROELECTRONICS

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STFPC320

Functional description

19/78

4.11

Remote control decoder

Remote control (RC) decoder module decodes the signal coming from IR_DATA_IN. The list

of IR remote control protocols recognized by STFPC320 is Philips RC-5, SONY, NEC,

Thomson-RCA, Thomson-R2000 and Matsushita. The selection of remote control protocol

to use is done by setting the RC Protocols register. The commands from RC is used to

wake-up from standby and resume normal operation. All RC keys can be programmed to act

like RC hotkeys. Upon receiving any one of the designated hotkeys, wake-up operation will

begin.

4.12

PIN_AV8

External device (e.g. set-top box) could pull this pin high to wake-up the system. A low-to-

high transition on this pin will signal the STPFC320 to wake-up and provide power to the

system. This signal is considered high when it is in the range of 2.5 - 3.6 V (proper voltage

division must be done externally so that the STFPC320 PIN_AV8 sees no more than 3.6 V).

No action is taken on the high-to-low transition on PIN_AV8. Also when the pin is already a

high, the current state of the system is maintained and it does not trigger anything.

4.13

Default state upon power-up

The Table 3 below shows the default state of the STFPC320 upon power-up.

Table 3.

Default state

S.No.

Functions

Default state

Display

OFF

2Key-scan

IR (Remote Control)

Display mode

12 segment/16 digit

Display address

10H with Address increment mode

RC protocol

RC-5 (Raw format)

7LED

OFF

Dimming

1/16 duty factor

Hot Keys (IR and FP)

Disabled

Guard timer

10s

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