PCF85063TP datasheet(11/52 Pages) NXP

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PCF85063TP

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Product data sheet

Rev. 4 — 6 May 2015

11 of 52

NXP Semiconductors

PCF85063TP

Tiny Real-Time Clock/calendar

8.2.2 Register Control_2

[1]

Default value.

8.2.2.1

MI and HMI: minute and half minute interrupt

The minute interrupt (bit MI) and half minute interrupt (bit HMI) are pre-defined timers for

generating interrupt pulses on pin INT; see Figure 7. The timers are running in sync with

the seconds counter (see Table 19 on page 17).

The minute and half minute interrupts must only be used when the frequency offset is set

to normal mode (MODE = 0), see Section 8.2.3. In normal mode, the interrupt pulses on

pin INT are 1⁄64 s wide.

When starting MI, the first interrupt will be generated after 1 second to 59 seconds. When

starting HMI, the first interrupt will be generated after 1 second to 29 seconds.

Subsequent periods do not have such a delay. The timers can be enabled independently

from one another. However, a minute interrupt enabled on top of a half minute interrupt is

not distinguishable.

Table 9.

Control_2 - control and status register 2 (address 01h) bit description

Bit

Symbol

Value

Description

7 to 6

unused

5MI

minute interrupt

0[1]

disabled

enabled

4HMI

half minute interrupt

0[1]

disabled

enabled

3TF

timer flag

0[1]

no timer interrupt generated

flag set when timer interrupt generated

2 to 0

COF[2:0]

see Table 11

CLKOUT control

In this example, the TF flag is not cleared after an interrupt.

Fig 7.

INT example for MI

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