CONTENTS

1 Chip Overview.............................................................................................................................. 1

2 Functional Description.................................................................................................................. 2

2.1 Summary............................................................................................................................ 2

2.2 Alarm function modes........................................................................................................4

2.3 Timer.................................................................................................................................. 4

2.4 CLKOUT output................................................................................................................ 4

2.5 Reset................................................................................................................................... 4

2.6 Voltage-low detector..........................................................................................................4

2.7 Register organization.........................................................................................................5

2.7.1 Control/Status 1 register......................................................................................... 6

2.7.2 Control/Status 2 register......................................................................................... 6

2.7.3 Seconds, Minutes and Hours registers....................................................................7

2.7.4 Days, Weekdays, Months/Century and Years registers......................................... 7

2.7.5 Alarm registers........................................................................................................9

2.7.6 CLKOUT frequency register................................................................................ 10

2.7.7 Countdown timer registers....................................................................................10

2.8 EXT_CLK test mode........................................................................................................11

2.9 Power-On Reset override mode....................................................................................... 12

3 Serial interface.............................................................................................................................12

.................................................................................................................

14

4 Parameters................................................................................................................................... 15

5 Application Reference.................................................................................................................19

5.1 Crystal frequency adjustment.......................................................................................... 19

6 Package outline........................................................................................................................... 20

6.1

6.2

HM8563