Micro Crystal
Ultra Small Real-Time Clock Module with I
2
C-Bus Interface
RV-8263-C7
January 2019
2/61
Rev. 1.0
TABLE OF CONTENTS
1.
OVERVIEW ..................................................................................................................................................... 4
GENERAL DESCRIPTION ......................................................................................................................... 4
1.1.
APPLICATIONS ......................................................................................................................................... 5
1.2.
ORDERING INFORMATION ...................................................................................................................... 5
1.3.
2.
BLOCK DIAGRAM ......................................................................................................................................... 6
PINOUT ...................................................................................................................................................... 7
2.1.
PIN DESCRIPTION .................................................................................................................................... 7
2.2.
FUNCTIONAL DESCRIPTION ................................................................................................................... 8
2.3.
DEVICE PROTECTION DIAGRAM ........................................................................................................... 9
2.4.
3.
REGISTER ORGANIZATION ....................................................................................................................... 10
REGISTER OVERVIEW ........................................................................................................................... 10
3.1.
CONTROL REGISTERS .......................................................................................................................... 11
3.2.
TIME AND DATE REGISTERS ................................................................................................................ 14
3.3.
ALARM REGISTERS ............................................................................................................................... 17
3.4.
TIMER REGISTERS ................................................................................................................................. 20
3.5.
REGISTER RESET VALUES SUMMARY ............................................................................................... 21
3.6.
4.
DETAILED FUNCTIONAL DESCRIPTION .................................................................................................. 22
POWER ON RESET (POR) ...................................................................................................................... 22
4.1.
SOFTWARE RESET ................................................................................................................................ 22
4.2.
OSCILLATOR STOP FLAG ..................................................................................................................... 23
4.3.
SETTING AND READING THE TIME ...................................................................................................... 24
4.4.
INTERRUPT OUTPUT ............................................................................................................................. 25
4.5.
ALARM FUNCTION ................................................................................................................................. 26
4.6.
ALARM INTERRUPT ........................................................................................................................ 26
4.6.1.
COUNTDOWN TIMER FUNCTION .......................................................................................................... 27
4.7.
TIMER FLAG TF ............................................................................................................................... 27
4.7.1.
TIMER INTERRUPT MODE TI_TP ................................................................................................... 27
4.7.2.
PULSE GENERATOR 2 .................................................................................................................... 27
4.7.3.
USE OF THE COUNTDOWN TIMER ............................................................................................... 28
4.7.4.
MINUTE AND HALF MINUTE INTERRUPT FUNCTION ........................................................................ 30
4.8.
PULSE GENERATOR 1 .................................................................................................................... 30
4.8.1.
FREQUENCY OFFSET COMPENSATION ............................................................................................. 31
4.9.
OFFSET COMPENSATION CALCULATION WORKFLOW ............................................................. 32
4.9.1.
COMPENSATION INTERRUPT FUNCTION ........................................................................................... 34
4.10.
COMPENSATION PULSES WHEN MODE = 0 (NORMAL MODE) ................................................. 34
4.10.1.
COMPENSATION PULSES WHEN MODE = 1 (FAST MODE) ....................................................... 35
4.10.2.
CLKOUT FREQUENCY SELECTION ..................................................................................................... 36
4.11.
STOP BIT FUNCTION .............................................................................................................................. 37
4.12.
