Datasheet

PCF85063TP All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 3 — 11 July 2013 10 of 47
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 16
).
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 - 00 unused
5MI minute interrupt
0
[1]
disabled
1 enabled
4HMI half minute interrupt
0
[1]
disabled
1 enabled
3TF timer flag
0
[1]
no timer interrupt generated
1 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
Table 10. Effect of bits MI and HMI on INT
generation
Minute interrupt (bit MI) Half minute interrupt (bit HMI) Result
0 0 no interrupt generated
1 0 an interrupt every minute
0 1 an interrupt every 30 s
1 1 an interrupt every 30 s
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