STC5455 datasheet(47/56 Pages) CONNOR-WINFIELD

47 / 56 page

Page 47 of 56 TM121

Rev:P1.3

Date: October 24, 2011

STC5455

Synchronous Clock for SETS

Data sheet

Preliminary

will trigger internal soft-reset. Initial default accepted frequency for STC5455 is 12.8MHz. The accepted fre-

quency of MCLK input returns to 12.8MHz following any regular reset.

Perform writes at least 50us after the regular reset has done.

Written value is shown below:

This register allows the user read back three values as follows:

FRQID

Indicates the ID of the frequency of MCLK that the STC5455 currently accept. Constant 1 can be read from

FRQID initially since the default accepted frequency for the STC5455 is 12.8MHz. The value of FRQID can

only be updated when three consecutive valid writes are written to the register MCLK_Freq_Reset completely.

COUNT

Indicates how many times this register has been written to. COUNT is set to 1 when each time a different valid

associated value is written to for the first time. COUNT is clear to 0 after three times valid writes are completed.

ID_Written_Value

Indicates the ID of the associated value that is being written to this register. The ID is updated when each time

a different valid associated value is written to this register for the first time.

Bit 7 ~ 0

External Oscillator Frequency Selection

0x11

10MHz

0x22

12.8MHz

0x44

19.2MHz

0x88

20MHz

Address

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0x7F

FRQID

COUNT

ID_Written_Value

Bit 7 ~ 6 FRQID

MCLK Frequency

10MHz

12.8MHz

19.2MHz

20MHz

Bit 5 ~ 4

COUNT

Counter

Not written or invalid

Once

Twice

Three times

STC5455 Datasheet(PDF) 47 Page - Connor-Winfield Corporation

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