PCF8583
NXP Semiconductors
Clock and calendar with 240 x 8-bit RAM
Table 4.
Cycle length of the time counters, clock modes
Counting cycle Carry to next unit
Unit
Contents of month
calendar
hundredths of a second
seconds
00 to 99
00 to 59
00 to 59
00 to 23
12 am
99 to 00
-
59 to 00
-
minutes
59 to 00
-
hours (24)
23 to 00
-
hours (12)
-
-
-
-
01 am to 11 am
12 pm
-
-
01 pm to 11 pm 11 pm to 12 am
-
date
01 to 31
01 to 30
01 to 29
01 to 28
01 to 12
0 to 3
31 to 01
30 to 01
29 to 01
28 to 01
12 to 01
-
1, 3, 5, 7, 8, 10, and 12
4, 6, 9, and 11
2, year = 0
2, year = 1, 2, and 3
months
year
-
-
-
-
weekdays
timer
0 to 6
6 to 0
00 to 99
no carry
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 Figure 10).
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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