PCF8583PF5-112 Datasheet, PDF (12/37 Pages) NXP Semiconductors – Clock and calendar with 240 x 8-bit RAM

NXP Semiconductors
PCF8583
Clock and calendar with 240 x 8-bit RAM
MUX
mode
select
oscillator
counter
control
CLOCK/CALENDAR
ALARM
TIMER
clock
alarm
alarm timer
timer
control alarm ^overflow control
7 654 321 0
CONTROL/STATUS
REGISTER (1)
7 654 321 0
ALARM CONTROL
REGISTER
alarm
interrupt
timer overflow
interrupt
INT
013aaa377
(1) If the alarm enable bit of the control and status register is reset (logic 0), a 1 Hz signal is observed on the interrupt pin INT.
Fig 12. Alarm and timer interrupt logic diagram
7.8 Event counter mode
Event counter mode is selected by bits 4 and 5 which are logic 10 in the control and status
register. The event counter mode is used to count pulses externally applied to the
oscillator input (OSCO left open-circuit).
The event counter stores up to 6 digits of data, which are stored as 6 hexadecimal values
located in the registers 1h, 2h, and 3h. Therefore, up to 1 million events may be recorded.
An event counter alarm occurs when the event counter registers match the value
programmed in the registers 9h, Ah, and Bh, and the event alarm is enabled (bits 4 and 5
which are logic 01 in the alarm control register). In this event, the alarm flag (bit 1 of the
control and status register) is set. The inverted value of this flag can be transferred to the
interrupt pin (pin 7) by setting the alarm interrupt enable in the alarm control register. In
PCF8583
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 06 — 6 October 2010
© NXP B.V. 2010. All rights reserved.
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