MC44CC373CAS datasheet(17/28 Pages) FREESCALE

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MC44CC373

OPTION CONTROL REGISTER 2 FORMAT

The format for the Optional Control Register 2, OCR2, is

shown in Figure 9. Bits R14:R2 are not defined for system

applications. They are for manufacturing test only. For nor-

mal operation these bits must be set as defined by the re-

set state.

The Peak White Clip level may be set by setting bit PW1

and PW0 as listed in Table 20. The default (power-up) setting

is 1.0 volts.

When UHF oscillator is disabled, do not write to Option

Control Registers 1 and 2. Any other time, writing to Option

Control Registers 1 and 2 is allowed.

DATA/STATUS REGISTER FORMAT

The data/status read back format is shown in Figure 10.

The first byte contains the status information on the RF oscil-

lator out-of-frequency range and is the same format used by

the legacy devices. Therefore, current legacy software will be

unaffected as it will only read back this most significant byte.

During manufacturing test, additional two byte registers

are read back without sending a stop condition. This read

back data has no significance to end system applications.

Therefore if it is read by a master, it should be ignored.

The bit description for the status byte is listed in Table 21.

Figure 10. Status/Data Register Format

MSB

LSB

R15

R14

R13

R12

R11

R10

Reset

State

Reserved for manufacturing test purposes only

PW1

PW0

Adr

Peak White

clip level

Figure 9. Option Control Register 2 Format

MSB

LSB

OOR

Reserved

OSC Status

Table 20. Option Control Register 2, Bit Description

Bit Name

Description

Adr

Address Function bit. Must be set to a logic 1.

14-2

—

Reserved for manufacturing test.

PW1

Peak White Clip level

PW1

PW0

Video Modulation Depth

for video = 1.4 VCVBS

90%

PW0

94%

91%

92.5%

Table 21. Status Byte Bit Description

Bit

Name

Description

R7:R3

Reserved

Frequency Too High / Too Low

VCO out of range, frequency too

low, only valid if OOR=1

VCO out of range, frequency too

high, only valid if OOR=1

Low/High VCO Active

High VCO is active

Low VCO is active

OOR

UHF Osc Out of Freq. Range

Normal operation, VCO in range

VCO out of range

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