PCF85063ATLSLASH1 datasheet(26/55 Pages) NXP

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NXP Semiconductors

PCF85063A

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

7.6.2 Register Timer_mode

Bit

Symbol

Value

Description

7 to 5

000

unused

timer clock frequency

4.096 kHz timer source clock

64 Hz timer source clock

1 Hz timer source clock

4 to 3

TCF[1:0]

11[1]

1⁄60 Hz timer source clock

timer enable

0[1]

timer is disabled

timer is enabled

timer interrupt enable

0[1]

no interrupt generated from timer

TIE

interrupt generated from timer

timer interrupt mode

0[1]

interrupt follows timer flag

TI_TP[2]

interrupt generates a pulse

Table 34. Timer_mode - timer control register (address 11h) bit description

[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 7.2.2.3.

7.6.3 Timer functions

The timer has four selectable source clocks allowing for countdown periods in the range from 244 μs to 4 hours

15 min. For periods longer than 4 hours, the alarm function can be used.

Delay

TCF[1:0]

Timer source clock

frequency[1]

Minimum timer duration

T = 1

Maximum timer duration

T = 255

4.096 kHz

244 μs

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

Table 35. Timer clock frequency and timer durations

[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.

PCF85063A

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 7.1 — 8 November 2023

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