PCF8523TS View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
'PCF8523TS' PDF : 74 Pages View PDF
NXP Semiconductors
PCF8523
Real-Time Clock (RTC) and calendar
Table 35. CLKOUT frequency selection
COF[2:0] CLKOUT frequency (Hz)
Typical duty cycle[1]
000[2]
32 768
60 : 40 to 40 : 60
001
16 384
50 : 50
010
8 192
50 : 50
011
4 096
50 : 50
100
1 024
50 : 50
101
32
50 : 50[3]
110
1
50 : 50[3]
111
CLKOUT disabled (high-Z)
[1] Duty cycle definition: % HIGH-level time : % LOW-level time.
[2] Default value.
[3] Clock frequencies may be affected by offset correction.
Effect of STOP bit
no effect
no effect
no effect
CLKOUT = high-Z
CLKOUT = high-Z
CLKOUT = high-Z
CLKOUT = high-Z
8.9.1.3 Register Tmr_A_freq_ctrl
Table 36. Tmr_A_freq_ctrl - timer A frequency control register (address 10h) bit
description
Bit
Symbol
Value
Description
7 to 3 -
-
unused
2 to 0 TAQ[2:0]
source clock for timer A (see Table 40)
000
4.096 kHz
001
64 Hz
010
1 Hz
011
111[1]
110
100
1⁄60 Hz
1⁄3600 Hz
[1] Default value.
8.9.1.4 Register Tmr_A_reg
Table 37. Tmr_A_reg - timer A value register (address 11h) bit description
Bit
Symbol
Value
Description
7 to 0 T_A[7:0]
00 to FF
timer value[1]
[1] Timer period in seconds: timerperiod = ---------------------------T---_---A----------------------------- where T_A is the countdown value.
SourceClockFrequency
PCF8523
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 7 — 28 April 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
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