Micro Crystal

Real Time Clock / Calendar Module

RV-8564

2/40

TABLE OF CONTENTS

1. OVERVIEW ........................................................................................................................................................ 4

2. GENERAL DESCRIPTION ................................................................................................................................ 4

3. BLOCK DIAGRAM............................................................................................................................................. 5

4. PINOUT .............................................................................................................................................................. 6

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

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

6.1. CLKOUT OUTPUT ..................................................................................................................................... 8

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

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

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

8.2. CONTROL REGISTERS ............................................................................................................................ 9

8.2.1. CONTROL / STATUS 1 (address 00h…bits description) ................................................................... 9

8.2.2. CONTROL / STATUS 2 (address 01h…bits description) ................................................................. 10

8.3. TIME AND DATE REGISTERS................................................................................................................ 10

8.3.1. SECONDS (address 02h…bits description) ..................................................................................... 10

8.3.2. MINUTES (address 03h…bits description) ....................................................................................... 10

8.3.3. HOURS (address 04h…bits description) .......................................................................................... 11

8.3.4. DAYS (address 05h…bits description).............................................................................................. 11

8.3.5. WEEKDAYS (address 06h…bits description) ................................................................................... 11

8.3.6. MONTHS / CENTURY (address 07h…bits description) ................................................................... 12

8.3.7. YEARS (address 08h…bits description) ........................................................................................... 13

8.4. ALARM REGISTERS ............................................................................................................................... 13

8.4.1. MINUTE ALARM (address 09h…bits description) ............................................................................ 13

8.4.2. HOUR ALARM (address 0Ah…bits description)............................................................................... 13

8.4.3. DAY ALARM (address 0Bh…bits description) .................................................................................. 13

8.4.4. WEEKDAY ALARM (address 0Ch…bits description) ....................................................................... 14

8.5. CLKOUT REGISTER ............................................................................................................................... 14

8.5.1. CLKOUT FREQUENCY (address 0Dh…bits description) ................................................................ 14

8.6. TIMER REGISTER ................................................................................................................................... 14

8.6.1. TIMER CONTROL (address 0Eh…bits description) ......................................................................... 15

8.6.2. TIMER (address 0Fh…bits description) ............................................................................................ 15

8.7. REGISTER RESET VALUES................................................................................................................... 16

9. DETAILED FUNCTIONAL DESCRIPTION ..................................................................................................... 17

9.1. INTERRUPT OUTPUT ............................................................................................................................. 17

9.1.1. BITS TF AND AF............................................................................................................................... 17

9.1.2. BITS TIE AND AIE ............................................................................................................................ 17

9.1.3. COUNTDOWN TIMER INTERRUPT ................................................................................................ 17

9.2. VOLTAGE LOW DETECTOR AND CLOCK MONITOR ......................................................................... 18