EEPROM Busy Status Bit

- EB

This bit is set to

²1² when a write operation to the EEPROM has not completed. When this bit is set to

²1², reading data from the EEPROM or writing data to the EEPROM is invalid. After an EEPROM

write has finished, this bit will be cleared to

²0² and the user can read data from the EEPROM or write

data to the EEPROM.

Output Enable On Battery Mode Bit

- OEOBM

This bit enables/disables the IRQ/FOUT pin in the battery mode. When the OEOBM bit is set to

²1²,

the IRQ/FOUT pin is disabled in the battery mode and the frequency output and alarm function are

disabled. When the OEOBM bit is cleared to

²0², the IRQ/FOUT pin is enabled in the battery mode.

Low Power Mode Bit

- LPM

This bit enables/disables the Low Power Mode. When the LPM bit is cleared to

²0², the device will be

in the normal mode and will use the V

BAT

supply when V

DD

<V

BAT

and V

DD

<V

COMP

. When the LPM bit is

set to

²1², the device is in the Low Power Mode and uses the V

BAT

supply when V

DD

<V

BAT

.

Frequency Output Bits

- FO3~FO0

These bits enable/disable the frequency output function and selects the output frequency at the FOUT

pin. The frequency selection table is shown below. It overrides the alarm mode. The 1, 1/2, 1/4, 1/8,

1/16, 1/32 frequency outputs are compensated.

FOUT(Hz)

FO3

FO2

FO1

FO0

¾

0000

32768

0001

4096

0010

1024

0011

64

0100

32

0101

16

0110

80111

41000

21001

11010

1/2

1011

1/4

1100

1/8

1101

1/16

1110

1/32

1111

HT1382

Rev. 1.40

13

May 27, 2011