PCF8583P datasheet(9/28 Pages) PHILIPS

9 / 28 page

1997 Jul 15

Philips Semiconductors

Product speciﬁcation

Clock/calendar with 240

× 8-bit RAM

PCF8583

Table 1

Cycle length of the time counters, clock modes

UNIT

COUNTING CYCLE

CARRY TO NEXT UNIT

CONTENTS OF THE

MONTH COUNTER

Hundredths of a second

00 to 99

99 to 00

−

Seconds

00 to 59

59 to 00

−

Minutes

00 to 59

59 to 00

−

Hours (24 h)

00 to 23

23 to 00

−

Hours (12 h)

12 AM

−−

01 AM to 11 AM

−−

12 PM

−−

01 PM to 11 PM

11 PM to 12 AM

−

Date

01 to 31

31 to 01

1, 3, 5, 7, 8, 10 and 12

01 to 30

30 to 01

4, 6, 9 and 11

01 to 29

29 to 01

2, year = 0

01 to 28

28 to 01

2, year = 1, 2 and 3

Months

01 to 12

12 to 01

−

Year

0 to 3

−−

Weekdays

0 to 6

6 to 0

−

Timer

00 to 99

no carry

−

7.5

Alarm control register

When the alarm enable bit of the control/status register is

set (address 00, bit 2) the alarm control register (address

08) is activated. All alarm, timer, and interrupt output

functions are controlled by the contents of the alarm

control register (see Fig.8).

7.6

Alarm registers

All alarm registers are allocated with a constant address

offset of hexadecimal 08 to the corresponding counter

registers (see Fig.4, Register arrangement).

An alarm signal is generated when the contents of the

alarm registers matches bit-by-bit the contents of the

involved counter registers. The year and weekday bits are

ignored in a dated alarm. A daily alarm ignores the month

and date bits. When a weekday alarm is selected, the

contents of the alarm weekday/month register will select

the weekdays on which an alarm is activated (see Fig.9).

Remark: In the 12 h mode, bits 6 and 7 of the alarm hours

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