AS8228 datasheet(42/123 Pages) AMSCO

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Data Sheet AS8218 / AS8228

Revision 3.0, 31-May-06

Page 42 of 123

Note: Alarm interrupts are only generated on rising clk_1hz edges (using system clock for detection). This

means that enabling an alarm after that will not generate an interrupt.

Seconds / VL Register (9100h)

MSB

LSB

sec.6

sec.5

sec.4

sec.3

sec.2

sec.1

sec.0

Bit

Symbol Function

VL = 0; reliable clock / calendar information guaranteed.

VL = 1; clock / calendar information is NOT guaranteed.

This bit is set after power-up of VDD_BAT. It can be cleared by software only.

sec.6

sec.5

sec.4

sec.3

sec.2

sec.1

sec.0

These bits represent current seconds value encoded in BCD format (values from 0 to 59).

Minutes Register (9101h)

MSB

LSB

min.6

min.5

min.4

min.3

min.2

min.1

min.0

These bits represent current minute value encoded in BCD format (values from 0 to 59).

Hours Register (9102h)

MSB

LSB

hour.5

hour.4

hour.3

hour.2

hour.1

hour.0

These bits represent the current hours value encoded in BCD format (values from 0 to 23).

Days Register (9103h)

MSB

LSB

day.5

day.4

day.3

day.2

day.1

day.0

These bits represent current day value encoded in BCD format (values from 1 to 31).

Note on leap years: ‘00’ years in general are no leap years unless the complete year can be divided by 400

(e.g. 2000). Since the year 2000 has passed already, this chip will not consider a leap year for ‘00’ years.

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