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PCF8583P

Clock/calendar with 240×8-bit RAM

Philips Electronics 

Philips Semiconductors

Clock/calendar with 240 × 8-bit RAM

Product specification

PCF8583

Table 1 Cycle length of the time counters, clock modes

UNIT

Hundredths of a second

Seconds

Minutes

Hours (24 h)

Hours (12 h)

Date

Months

Year

Weekdays

Timer

COUNTING CYCLE

00 to 99

00 to 59

00 to 59

00 to 23

12 AM

01 AM to 11 AM

12 PM

01 PM to 11 PM

01 to 31

01 to 30

01 to 29

01 to 28

01 to 12

0 to 3

0 to 6

00 to 99

CARRY TO NEXT UNIT

99 to 00

59 to 00

59 to 00

23 to 00

−

−

−

11 PM to 12 AM

31 to 01

30 to 01

29 to 01

28 to 01

12 to 01

−

6 to 0

no carry

CONTENTS OF THE

MONTH COUNTER

−

−

−

−

−

−

−

−

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

4, 6, 9 and 11

2, year = 0

2, year = 1, 2 and 3

−

−

−

−

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

register must be the same as the hours counter.

1997 Jul 15

9

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