PCF85063ATLSLASH1 datasheet(12/55 Pages) NXP

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NXP Semiconductors

PCF85063A

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

7.2.2.2 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 10. The timers are running in sync with the seconds counter (see Table 18).

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

(MODE = 0), see Section 7.2.3. 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.

aaa-004419

seconds counter

minutes counter

INT when MI enabled

TF when MI enabled

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

Figure 10. INT example for MI

Minute interrupt (bit MI)

Half minute interrupt (bit HMI)

Result

no interrupt generated

an interrupt every minute

an interrupt every 30 s

Table 9. Effect of bits MI and HMI on INT generation

The duration of the timer is affected by the register Offset (see Section 7.2.3). Only when OFFSET[6:0] has the

value 00h the periods are consistent.

7.2.2.3 TF: timer flag

The timer flag (bit TF) is set logic 1 on the first trigger of MI, HMI, or the countdown timer. The purpose of the

flag is to allow the controlling system to interrogate what caused the interrupt: timer or alarm. The flag can be

read and cleared by command.

The status of the timer flag TF can affect the INT pulse generation depending on the setting of TI_TP (see

Section 7.6.2):

• When TI_TP is set logic 1

– an INT pulse is generated independent of the status of the timer flag TF

– TF stays set until it is cleared

– TF does not affect INT

– the countdown timer runs in a repetitive loop and keeps generating timed periods

• When TI_TP is set logic 0

– the INT generation follows the TF flag

– TF stays set until it is cleared

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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