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PCF8583PF5-112 Datasheet(PDF) 13 Page - NXP Semiconductors

Part No. PCF8583PF5-112
Description  Clock and calendar with 240 x 8-bit RAM
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF8583PF5-112 Datasheet(HTML) 13 Page - NXP Semiconductors

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PCF8583
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 06 — 6 October 2010
13 of 37
NXP Semiconductors
PCF8583
Clock and calendar with 240 x 8-bit RAM
this mode, the timer (location 07h) increments once for every one, one hundred, ten
thousand, or 1 million events, depending on the value programmed in bits 0, 1 and 2 of
the alarm control register. In all other events, the timer functions are as in the clock mode.
7.9 Interrupt output
The conditions for activating the output INT (active LOW) are determined by appropriate
programming of the alarm control register. These conditions are clock alarm, timer alarm,
timer overflow, and event counter alarm. An interrupt occurs when the alarm flag or the
timer flag is set, and the corresponding interrupt is enabled. In all events, the interrupt is
cleared only by software resetting of the flag which initiated the interrupt.
In the clock mode, if the alarm enable is not activated (alarm enable bit of the control and
status register is logic 0), the interrupt output toggles at 1 Hz with a 50 % duty cycle (may
be used for calibration). This is the default power-on state of the device. The OFF voltage
of the interrupt output may exceed the supply voltage, up to a maximum of 6.0 V. A logic
diagram of the interrupt output is shown in Figure 12.
7.10 Oscillator and divider
A 32.768 kHz quartz crystal has to be connected to OSCI and OSCO. A trimmer capacitor
between OSCI and VDD is used for tuning the oscillator (see Section 11.1). A 100 Hz clock
signal is derived from the quartz oscillator for the clock counters.
Fig 13. Alarm control register, event counter mode
memory location 08h
reset state: 0000 0000
timer function:
clock alarm function:
timer alarm enable:
alarm interrupt enable:
7
654
321
0
MSB
LSB
013aaa376
000
001
010
011
100
101
110
111
no timer
units
100
10 000
1 000 000
not allowed
not allowed
test mode, all counters
in parallel
timer interrupt enable:
0
1
timer flag, no interrupt
timer flag, interrupt
00
01
10
11
no event alarm
event alarm
not allowed
not allowed
0
1
no timer alarm
timer alarm
0
1
alarm flag, no interrupt
alarm flag, interrupt


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