MC44BC373/4C 데이터 시트보기 (PDF) - Freescale Semiconductor

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MC44BC373/4C

PLL-Tuned UHF and VHF Audio/Video High-Integration Modulator

Freescale Semiconductor 

I2C Programming

Table 15 lists the UHF settings used.

Table 15. UHF Settings

Bit

OSC

ATT

Value

0

1

0

1

Setting

UHF Oscillator

Normal operation

UHF oscillator disabled (oscillator and PLL sections bias turned off)

Modulator Output Attenuation

Normal operation

Modulator output attenuation (sound and video modulators sections bias turned off)

Table 16 lists the other settings used.

Table 16. Other Settings

Bit

SREF

LOP

OSC

SO

ATT

Value

0

1

0

1

1, 1, 1

Setting

Sound PLL

Sound reference frequency = 31.25 kHz.

Sound reference frequency = 62.5 kHz.

Logic Output Port

LOP pin is low voltage.

LOP pin is high impedance.

Standby Mode

Puts the MC44BS373CA into standby mode. See Section 15.3, “Standby Mode,” for

more information.

Table 17 lists settings of fields X2, X1, and X0, used to set the device into test mode 1 and to control the

VHF range.

NOTE

Test modes 1 and 2 are intended for manufacturing test purposes only and

cannot be used for normal applications, except for VHF range (states 1.b

to 1.e).

Table 17. Write Mode—Test Mode 1 and VHF Range

X2

X1

X0 State

Description

0

0

0

1.a Normal operation

0

0

1

1.b RF frequency divided for low-frequency testing or VHF range: RF/2

0

1

0

1.c RF/4

0

1

1

1.d RF/8

1

0

0

1.e RF/16

MC44BS373CA Data Sheet

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