NXP Semiconductors
PCF8583
Clock and calendar with 240 x 8-bit RAM
Cycle length of the time counters, clock modes
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
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 month
calendar
-
-
-
-
-
-
-
-
1, 3, 5, 7, 8, 10, and 12
4, 6, 9, and 11
2, year = 0
2, year = 1, 2, and 3
-
-
-
-
Table 4.
Unit
hundredths of a second
seconds
minutes
hours (24)
hours (12)
date
01 to 31
01 to 30
01 to 29
01 to 28
months
year
weekdays
timer
01 to 12
0 to 3
0 to 6
00 to 99
7.5 Alarm control register
When the alarm enable bit of the control and status register is set (address 00h, bit 2) the
alarm control register (address 08h) is activated. All alarm, timer, and interrupt output
functions are controlled by the contents of the alarm control register (see
PCF8583
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© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 06 — 6 October 2010
9 of 37
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