PCF8523TSSLASH1 datasheet(34/75 Pages) NXP

34 / 75 page

PCF8523

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Product data sheet

Rev. 4 — 5 July 2012

34 of 74

NXP Semiconductors

PCF8523

Real-Time Clock (RTC) and calendar

8.9.1.4

8.9.1.5

[1]

Default value.

8.9.1.6

Table 37.

Tmr_A_reg - timer A value register (address 11h) bit description

Bit

Symbol

Value

Description

7 to 0

TIMER_A_VALUE[7:0] 00 to FF

timer-period in seconds

where n is the countdown value

timerperiod

sourceclockfrequency

-----------------------------------------------------------

Table 38.

Tmr_B_freq_ctrl - timer B frequency control register (address 12h) bit

description

Bit

Symbol

Value

Description

unused

6 to 4

TBW[2:0]

low pulse width for pulsed timer B interrupt

000[1]

46.875 ms

001

62.500 ms

010

78.125 ms

011

93.750 ms

100

125.000 ms

101

156.250 ms

110

187.500 ms

111

218.750 ms

unused

2 to 0

TBQ[2:0]

source clock for timer B (see Table 40)

000

4.096 kHz

001

64 Hz

010

1 Hz

011

1⁄60 Hz

111[1]

110

100

1⁄3600 Hz

Table 39.

Tmr_B_reg - timer B value register (address 13h) bit description

Bit

Symbol

Value

Description

7 to 0

TIMER_B_VALUE[7:0] 00 to FF

timer-period in seconds

where n is the countdown value

timerperiod

sourceclockfrequency

-----------------------------------------------------------

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