STK17TA8

February 2004

17

Document Control # ML0023 rev 0.3

RTC Register Map

X - resevered for future use

* - not BCD values

Register Map Detail

Register

BCD DATA

FUNCTION/RANGE

D7

D6

D5

D4

D3

D2

D1

D0

1FFFFh

10 Years

Years

Years:

00 - 99

1FFFEh

X

X

X

10s

Months

Months

Months:

01 - 12

1FFFDh

X

X

10s Day of month

Day of Month

Day of Month:01 - 31

1FFFCh

XXXXX

Day of Week

Day of Week:01 - 07

1FFFBh

X

X

10s Hours

Hours

Hours:

00 - 23

1FFFAh

X

10s Minutes

Minutes

Minutes:

00 - 59

1FFF9h

X

10s Seconds

Seconds

Seconds: 00 - 59

1FFF8h

OSCEN

X

Cal Sign

Calibration

Calibration values*

1FFF7h

WDS

WDW

WDT

Watchdog*

1FFF6h

WIE

AIE

PFE

ABE

H/L

P/L

X

X

Interrupts*

1FFF5h

M

X

10s alarm date

alarm date

Alarm, Day of the Month: 01-31

1FFF4h

M

X

10s alarm hours

alarm hours

Alarm, Hours: 00-23

1FFF3h

M

10 alarm minutes

alarm minutes

Alarm, minutes: 00-59

1FFF2h

M

10 alarm seconds

alarm seconds

Alarm, seconds: 00-59

1FFF1h

10s Centuries

Centuries

Centuries: 00 - 99

1FFF0h

WDF

AF

PF

X

X

CAL

W

R

Flags*

1FFFFh

Timekeeping - Years

D7

D6

D5

D4

D3

D2

D1

D0

10 Years

Years

Contains the lower two BCD digits of the year. Lower nibble contains the value for years; upper nibble contains the value for 10s of years.

Each nibble operates from 0 to 9. The range for the register is 0-99.

1FFFEh

Timekeeping - Months

D7

D6

D5

D4

D3

D2

D1

D0

X

X

X

10s Months

Months

Contains the BCD digits of the month. Lower nibble contains the lower digit and operates from 0 to 9; upper nibble ( one bit) contains the

upper digit and operates from 0 to 1. The range for the register is 1-12.

1FFFDh

Timekeeping - Date

D7

D6

D5

D4

D3

D2

D1

D0

X

X

10s Day of month

Day of Month

Contains the BCD digits for the date of the month. Lower nibble contains the lower digit and operates from 0 to 9; upper nibble contains the

upper digit and operates from 0 to 3. The range for the register is 1-31.