AS8228 datasheet(40/123 Pages) AMSCO

40 / 123 page

Data Sheet AS8218 / AS8228

Revision 3.0, 31-May-06

Page 40 of 123

RTC Registers

Address

Reset Value

Notes

Seconds / VL

9100h

80h

Minutes

9101h

00h

Hours

9102h

00h

Days

9103h

01h

Day of the Week

9104h

00h

Month / Century

9105h

01h

Years

9106h

00h

Control / Status 1

9110h

10h

Control / Status 2

9111h

00h

Seconds Timer Byte 0

9112h

01h

Seconds Timer Byte 1

9113h

00h

Minute Alarm 1

9114h

00h

Hour Alarm 1

9115h

00h

Day Alarm 1

9116h

01h

Month Alarm 1

9117h

01h

Years Alarm 1

9118h

00h

Minute Alarm 2

9119h

00h

Hour Alarm 2

911Ah

00h

Day Alarm 2

911Bh

01h

Month Alarm 2

911Ch

01h

Years Alarm 2

911Dh

00h

Divider Register Byte 0

9130h

84h

[7:0] = div [7:0] (LP_DIV)

Divider Register Byte 1

9131h

ECh

[7:0] = div [15:8] (LP_DIV)

Divider Register Byte 2

9132h

0Ah

[3:0] = div [19:16] (LP_DIV)

Frequency Trim

9133h

00h

Notes:

1) If illegal values (i.e. not defined in the following tables, e.g. ‘0’, no BCD code, not correct last day of month,

not correct leap year) are written to the time/date registers (00h – 06h), they are corrected to the first valid

number (‘automatic correction’)! Then an interrupt is generated and the TSA flag in the Control/Status 2

2) All other registers are not corrected (e.g. alarm info incorrect

alarm is not met).

3) After power-up of VDD_BAT the time/date registers are stopped, the WAIT flag (Control/Status 1) is set.

4) Unused addresses will simply be ignored.

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