PCF8523 NXP [NXP Semiconductors], PCF8523 Datasheet - Page 32

• Manufacturer Part Number: PCF8523
• Description: Real-Time Clock (RTC) and calendar
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCF8523
Product data sheet
8.9.1.3 Register Tmr_A_reg
8.9.1.4 Register Tmr_B_freq_ctrl
8.9.1.5 Register Tmr_B_reg
Table 35.
Table 36.
[1]
Table 37.
Bit
7 to 0
Bit
7
6 to 4
3
2 to 0
Bit
7 to 0
Default value.
Symbol
TIMER_A_VALUE[7:0] 00 to FF
Symbol
-
TBW[2:0]
-
TBQ[2:0]
Symbol
TIMER_B_VALUE[7:0] 00 to FF
Tmr_A_reg - timer A value register (address 11h) bit description
Tmr_B_freq_ctrl - timer B frequency control register (address 12h) bit
description
Tmr_B_reg - timer B value register (address 13h) bit description
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 30 March 2011
Value
Value
-
000
001
010
011
100
101
110
111
-
000
001
010
011
111
110
100
Value
[1]
[1]
Description
timer-period in seconds
where n is the countdown value
Description
unused
low pulse width for pulsed timer B interrupt
unused
source clock for timer B (see
Description
timer-period in seconds
where n is the countdown value
timerperiod
timerperiod
46.875 ms
62.500 ms
78.125 ms
93.750 ms
125.000 ms
156.250 ms
187.500 ms
218.750 ms
4.096 kHz
64 Hz
1 Hz
1
1


60
3600
Real-Time Clock (RTC) and calendar
Hz
Hz
=
=
---------------------------------------------------------- -
sourceclockfrequency
---------------------------------------------------------- -
sourceclockfrequency
n
n
PCF8523
© NXP B.V. 2011. All rights reserved.
Table
38)
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