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PCF8583P Datasheet(PDF) 9 Page - NXP Semiconductors

Part # PCF8583P
Description  Clock/calendar with 240 x 8-bit RAM
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF8583P Datasheet(HTML) 9 Page - NXP Semiconductors

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1997 Jul 15
9
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
register must be the same as the hours counter.


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