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MC44CC373

FREQUENCY REGISTER FORMAT

The format for the frequency register is shown in Figure 7.

The descriptions for the High-order and Low-order bits

(bytes) are listed in Table 15 and Table 16 respectively.

Figure 7. Frequency Register Format

The N Counter bits determine what UHF frequency is

used. N11:N0 is the binary number of 250 kHz steps in the

desired RFOUT frequency F. With:

NOTE:

Programming a division-ratio N = 0 is not allowed.

At power up the modulator will assume a default value for

the N Counter. The default is determined at time of manufac-

ture and is listed in Table 17 by the orderable part number.

MSB

LSB

R15

R14

R13

R12

R11

R10

See Table 17 for the default (reset) value.

Reset

State

TPEN

N11

N10

Adr

Test

Ptrn

N Counter

TEST MODE

Table 15. Frequency Register (High-order) Bit Descrip-

tion

Bit Name

Description

Adr

Address Function bit. Must be set to a logic 0.

TPEN

Test Pattern Enable.

Test pattern signal off (normal operation).

Test pattern signal on (picture and sound).

N11

N Counter program bits, N11:N6.

N10

Table 16. Frequency Register (Low-order) Bit Descrip-

tion

Bit Name

Description

N Counter program bits, N5:N0.

Test Mode bits, must be set to logic 0 for normal

operation. May be used for VHF divider.

2048 N11

1024 N10

×…… 4 N2

2 N1

+++

Table 17. Power-On Default Values for N Counter by Orderable Part Number

Orderable Part Number

Frequency

N Counter Value

Decimal

Hex

Binary

MC44CC373CAEF, MC44CC373CASEF,

MC44CC374CAEF

591.25

2365

0x93D

1001 0011 1101

MC44CC374T1AEF

871.25

3485

0xD9D

1101 1001 1101

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