PC8523-1(2012) 查看數據表（PDF） - NXP Semiconductors.
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PC8523-1 Datasheet PDF : 74 Pages
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NXP Semiconductors
PCF8523
Real-Time Clock (RTC) and calendar
8.8.2 Correction when MODE = 1
The correction is triggered once per minute and then correction pulses are applied once
per second up to a maximum of 60 pulses. When correction values greater than 60 pulses
are used, additional correction pulses are made in the 59th second.
Clock correction is made more frequently in MODE = 1; however, this can result in higher
power consumption.
Table 32. Correction pulses for MODE = 1
Correction value
Minute
Second
+1 or 1
02
+2 or 2
02
+3 or 3
02
:
:
+59 or 59
02
+60 or 60
02
+61 or 61
02
02
+62 or 62
02
02
+63 or 63
02
02
64
02
02
00
00 and 01
00, 01, and 02
:
00 to 58
00 to 59
00 to 58
59
00 to 58
59
00 to 58
59
00 to 58
59
Correction pulses on
INT1 per second[1]
1
1
1
:
1
1
1
2
1
2
1
4
1
5
[1] The correction pulses on pin INTx are 1⁄4096 s wide. For multiple pulses, they are repeated at an interval of
1⁄2048 s.
In MODE = 1, any timer source clock using a frequency below 4.096 kHz is also affected
by the clock correction (see Table 33).
Table 33. Effect of clock correction for MODE = 1
CLKOUT frequency (Hz) Effect of correction Timer source clock
frequency (Hz)
32 768
no effect
4 096
16 384
no effect
64
8 192
no effect
1
4 096
1 024
32
no effect
no effect
affected
1⁄60
1⁄3 600
-
1
affected
-
Effect of
correction
no effect
affected
affected
affected
affected
-
-
PCF8523
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 5 July 2012
© NXP B.V. 2012. All rights reserved.
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