RV-3049 datasheet(18/65 Pages) MICROCRYSTAL

18 / 65 page

Micro Crystal

DTCXO Temperature Compensated Real Time Clock / Calendar Module

RV-3049

18/65

3.5. TIMER PAGE REGISTER FUNCTION

The Timer Page contains 2 registers forming a 16-bit count down timer value.

Countdown Timer Value (addresses 18h / 19h…bits description)

Address

Function

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

18h

Timer Low

128

19h

Timer High

128

Address

Symbol

Value

Description

18h

Timer Low

1 to 255

These bits hold the Low Countdown Timer Value in binary format

19h

Timer High

0 to 255

These bits hold the High Countdown Timer Value in binary format

3.6. TEMPERATURE PAGE REGISTER FUNCTION

The Temperature Page register contains the result of the measured temperature ranging from -60°C (=0d) to

+190°C (=250d) with 0°C corresponding to a content of =60d.

During read / write access, the content of the register Temperature is frozen in a cache memory to prevent faulty

reading.

When the Thermometer is disabled by ThE = “0” (bit 1 in register EEPROM_Control), the register Temperature at

address 20h can be externally written.

Temperature Value (address 20h…bits description)

Address

Function

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

20h

Temperature

128

Address

Symbol

Value

Description

20h

Temperature

-60 to

+194°C

These bits hold the Temperature Value coded in binary format

3.7. EEPROM DATA PAGE REGISTER FUNCTION

The EEPROM Data Page contains 2 non-volatile EEPROM registers for user’s application.

Please see section 4.3 EEPROM MEMORY ACCESS for detailed instructions how to handle EEPROM read / write

access.

User EEPROM Data Registers (addresses 28h / 29h…bits description)

Address

Function

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

28h

EEPROM User

128

29h

EEPROM User

128

Address

Symbol

Value

Description

28h

EEPROM User

0 to 255

EEPROM User Data (2 Bytes)

29h

EEPROM User

0 to 255

RV-3049 Datasheet(PDF) 18 Page - MICORO CRYSTAL SWITZERLAND

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