PCF8593T Просмотр технического описания (PDF) - NXP Semiconductors.

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производитель

PCF8593T

Real-time clock/calendar

NXP Semiconductors. 

NXP Semiconductors

PCF8593

Low power clock and calendar

MSB

7 654

LSB

321 0

013aaa387

Fig 9. Alarm control registers, clock mode

memory location 08h

timer function:

000

no timer

001

hundredths of a second

010

seconds

011

minutes

100

hours

101

days

110

not used

111

test mode, all counters

in parallel

timer interrupt enable:

0

timer flag, no interrupt

1

timer flag, interrupt

clock alarm function:

00

no clock alarm

01

daily alarm

10

weekday alarm

11

dated alarm

timer alarm enable:

0

no timer alarm

1

timer alarm

alarm interrupt enable:

(only valid when alarm enable in

the control and status register is set)

0

alarm flag, no interrupt

1

alarm flag, interrupt

7.6 Alarm registers

All alarm registers are allocated with a constant address offset of 08h to the

corresponding counter registers (see Figure 8).

An alarm signal is generated when the contents of the alarm registers match bit-by-bit the

contents of the involved counter registers. The year and weekday bits are ignored in a

dated alarm. A daily alarm ignores the month and date bits. When a weekday alarm is

selected, the contents of the alarm weekday and month register selects the weekdays on

which an alarm is activated (see Figure 10).

Remark: In the 12 hour mode, bits 6 and 7 of the alarm hours register must be the same

as the hours counter.

PCF8593

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 04 — 6 October 2010

© NXP B.V. 2010. All rights reserved.

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