Rainbow-electronics DS1305 Manuel d'utilisateur télécharger pdf (Page 6)

DS1305

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Figure 2. RTC REGISTERS AND ADDRESS MAP

HEX ADDRESS

READ WRITE

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 RANGE

00H 80H 0 10-SEC SEC 00–59

01H 81H 0 10-MIN MIN 00–59

P 01–12 + P/A

02H 82H 0

24 10

10-HR HOURS

00–23

03H 83H 0 0 0 0 DAY 1–7

04H 84H 0 0 10-DATE DATE 1–31

05H 85H 0 0 10-MONTH MONTH 01–12

06H 86H 10 YEAR YEAR 00–99

——

ALARM 0

—

07H 87H M 10-SEC ALARM SEC ALARM 00–59

08H 88H M 10-MIN ALARM MIN ALARM 00–59

01–12 + P/A

09H 89H M

24 10

10 HR HOUR ALARM

00–23

0AH 8AH M 0 0 0 DAY ALARM 01–07

——

ALARM 1

—

0BH 8BH M 10-SEC ALARM SEC ALARM 00–59

0CH 8CH M 10-MIN ALARM MIN ALARM 00–59

01–12 + P/A

0DH 8DH M

24 10

10 HR HOUR ALARM

00–23

0EH 8EH M 0 0 0 DAY ALARM 01–07

0FH 8FH CONTROL REGISTER —

10H 90H STATUS REGISTER —

11H 91H TRICKLE CHARGER REGISTER —

12–1FH 92–9FH RESERVED —

20–7FH A0–FFH 96 BYTES USER RAM 00–FF

Note: Range for alarm registers does not include mask’m’ bits.

The DS1305 can be run in either 12-hour or 24-hour mode. Bit 6 of the hours register is defined as the

12- or 24-hour mode select bit. When high, the 12-hour mode is selected. In the 12-hour mode, bit 5 is the

AM/PM bit with logic high being PM. In the 24-hour mode, bit 5 is the second 10-hour bit (20 to 23

hours).

The DS1305 contains two time-of-day alarms. Time-of-day Alarm 0 can be set by writing to registers 87h

to 8Ah. Time-of-day Alarm 1 can be set by writing to registers 8Bh to 8Eh. The alarms can be

programmed (by the INTCN bit of the control register) to operate in two different modes; each alarm can

drive its own separate interrupt output or both alarms can drive a common interrupt output. Bit 7 of each

of the time-of-day alarm registers are mask bits (Table 1). When all of the mask bits are logic 0, a time-

of-day alarm only occurs once per week when the values stored in timekeeping registers 00h to 03h

match the values stored in the time-of-day alarm registers. An alarm is generated every day when bit 7 of

the day alarm register is set to a logic 1. An alarm is generated every hour when bit 7 of the day and hour

alarm registers is set to a logic 1. Similarly, an alarm is generated every minute when bit 7 of the day,

hour, and minute alarm registers is set to a logic 1. When bit 7 of the day, hour, minute, and seconds

alarm registers is set to a logic 1, alarm occurs every second.

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Rainbow-electronics DS1305 Manuel d'utilisateur Page 6

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