PCF8564A datasheet(30/65 Pages) NXP

30 / 65 page

PCF85063A

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Product data sheet

Rev. 7 — 30 March 2018

30 of 65

NXP Semiconductors

PCF85063A

Tiny Real-Time Clock/calendar with alarm function and I2C-bus

8.6.2 Register Timer_mode

[1]

Default value.

[2]

How the setting of TI_TP and the timer flag TF can affect the INT pulse generation is explained in

Section 8.2.2.3 on page 15.

8.6.3 Timer functions

The timer has four selectable source clocks allowing for countdown periods in the range

from 244

s to 4 hours 15 min. For periods longer than 4 hours, the alarm function can be

used.

[1]

When not in use, TCF[1:0] must be set to 1⁄60 Hz for power saving.

[2]

Time periods can be affected by correction pulses.

Remark: Note that all timings which are generated from the 32.768 kHz oscillator are

based on the assumption that there is 0 ppm deviation. Deviation in oscillator frequency

results in deviation in timings. This is not applicable to interface timing.

The timer counts down from a software-loaded 8-bit binary value, T[7:0], in register

Timer_value. Loading the counter with 0 stops the timer. Values from 1 to 255 are valid.

Table 35.

Timer_mode - timer control register (address 11h) bit description

Bit

Symbol

Value

Description

7 to 5

000

unused

4 to 3

TCF[1:0]

timer clock frequency

4.096 kHz timer source clock

64 Hz timer source clock

1 Hz timer source clock

11[1]

1⁄60 Hz timer source clock

2TE

timer enable

0[1]

timer is disabled

timer is enabled

1TIE

timer interrupt enable

0[1]

no interrupt generated from timer

interrupt generated from timer

0TI_TP[2]

timer interrupt mode

0[1]

interrupt follows timer flag

interrupt generates a pulse

Table 36.

Timer clock frequency and timer durations

TCF[1:0]

Timer source clock

frequency[1]

Delay

Minimum timer duration

T= 1

Maximum timer duration

T=255

4.096 kHz

244

s

62.256 ms

64 Hz

15.625 ms

3.984 s

1 Hz[2]

1 s

255 s

1⁄60 Hz[2]

60 s

4 hours 15 min

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