M41T93 datasheet(32/51 Pages) STMICROELECTRONICS

部品番号	M41T93

部品情報	Serial SPI bus RTC with battery switchover

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メーカー	STMICROELECTRONICS [STMicroelectronics]

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Clock operation

M41T93

32/51

3.9

Square wave output

The M41T93 offers the user a programmable square wave function which is output on the

SQW pin. RS3-RS0 bits located in 13h establish the square wave output frequency. These

frequencies are listed in Table 4. Once the selection of the SQW frequency has been

completed, the SQW pin can be turned on and off under software control with the Square

Wave Enable Bit (SQWE) located in Register 0Ah.

Note:

If the SQWE Bit is set to '1', and VCC falls below the switchover (VSO) voltage, the

squarewave output will be disabled.

Table 11.

Square wave output frequency

Square Wave Bits

Square Wave

RS3

RS2

RS1

RS0

Frequency

Units

0000

None

–

0001

32.768

kHz

0010

8.192

kHz

0011

4.096

kHz

0100

2.048

kHz

0101

1.024

kHz

0110

512

0111

256

1000

128

1001

1010

1011

11008

11014

11102

11111

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