NJU26123 View Datasheet(PDF) - Japan Radio Corporation

Part Name

Description

Manufacturer

NJU26123

Digital Signal Processor for TV

Japan Radio Corporation  

NJU26123

■ Pin setting

The NJU26123 operates default command setting after resetting the NJU26123. In addition, the NJU26123

restricts operation at power on by setting PROC pin (No.17) (Table 15). This pin is input pin. However, this pin

operates as bi-directional pin. Connect with VDD or VSS through 3.3kΩ resistance.

Table 15 Pin setting

Pin No. Symbol Setting

“High”

17

PROC

“Low”

Function

The NJU26123 does not operate after reset. Sending start

command is required for starting operation.

The NJU26123 operates default setting after reset. The default

value of Master Volume is Mute.

■ WatchDog Clock

The NJU26123 outputs clock pulse through WDC (No.18) pin during normal operation.

The NJU26123 generates a clock pulse through the WDC terminal after resetting the NJU26123. The WDC

clock is useful to check the status of the NJU26123 operation. For example, a microcomputer monitors the

WDC clock and checks the status of the NJU26123. When the WDC clock pulse is lost or not normal clock cycle,

the NJU26123 does not operate correctly. Then reset the NJU26123 and set up the NJU26123 again.

Watchdog clock output cycle is about 170msec.

Note: If input and output of an audio signal stop and an audio interface stops, WDC can’t output.

That is because it has controlled based on the signal of an audio interface.

Ver.2008-04-17

- 17 -

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