Micro Crystal

Real Time Clock / Calendar Module

RV-8523

2/57

TABLE OF CONTENTS

1. OVERVIEW ........................................................................................................................................................ 5

2. GENERAL DESCRIPTION ................................................................................................................................ 5

3. BLOCK DIAGRAM............................................................................................................................................. 6

4. PINOUT .............................................................................................................................................................. 7

5. PIN DESCRIPTION ............................................................................................................................................ 7

6. FUNCTIONAL DESCRIPTION........................................................................................................................... 8

7. DEVICE PROTECTION DIAGRAM ................................................................................................................... 8

8. REGISTER ORGANIZATION ............................................................................................................................ 9

8.1. REGISTER OVERVIEW ............................................................................................................................. 9

8.2. CONTROL REGISTERS .......................................................................................................................... 10

8.2.1. CONTROL 1 (address 00h…bits description)................................................................................... 10

8.2.2. CONTROL 2 (address 01h…bits description)................................................................................... 11

8.2.3. CONTROL 3 (address 02h…bits description)................................................................................... 11

8.3. TIME AND DATE REGISTERS................................................................................................................ 12

8.3.1. SECONDS (address 03h…bits description) ..................................................................................... 12

8.3.2. MINUTES (address 04h…bits description) ....................................................................................... 12

8.3.3. HOURS (address 05h…bits description) .......................................................................................... 13

8.3.4. DAYS (address 06h…bits description).............................................................................................. 13

8.3.5. WEEKDAYS (address 07h…bits description) ................................................................................... 14

8.3.6. MONTHS (address 08h…bits description)........................................................................................ 14

8.3.7. YEARS (address 09h…bits description) ........................................................................................... 15

8.4. ALARM REGISTERS ............................................................................................................................... 15

8.4.1. MINUTE ALARM (address 0Ah…bits description)............................................................................ 15

8.4.2. HOUR ALARM (address 0Bh…bits description)............................................................................... 15

8.4.3. DAY ALARM (address 0Ch…bits description) .................................................................................. 16

8.4.4. WEEKDAY ALARM (address 0Dh…bits description) ....................................................................... 16

8.5. FREQUENCY OFFSET REGISTER ........................................................................................................ 16

8.5.1. FREQUENCY OFFSET (address 0Eh…bits description) ................................................................. 17

8.6. TIMER AND CLKOUT REGISTERS ........................................................................................................ 18

8.6.1. TIMER & CLKOUT (address 0Fh…bits description)......................................................................... 18

8.6.2. TIMER A CLOCK (address 10h…bits description) ........................................................................... 18

8.6.3. TIMER A (address 11h…bits description)......................................................................................... 19

8.6.4. TIMER B CLOCK (address 12h…bits description) ........................................................................... 19

8.6.5. TIMER B (address 13h…bits description)......................................................................................... 19

8.7. RESET ...................................................................................................................................................... 20

8.7.1. REGISTER RESET VALUES............................................................................................................ 20

9. DETAILED FUNCTIONAL DESCRIPTION ..................................................................................................... 21

9.1. INTERRUPT ............................................................................................................................................. 21