PCF8593TD NXP Semiconductors, PCF8593TD Datasheet - Page 10

• Manufacturer Part Number: PCF8593TD
• Description: Real Time Clock LO PWR CLOCK/CAL
• Manufacturer: NXP Semiconductors

Specifications of PCF8593TD

• Function: Alarm, Timer Interrupt
• Rtc Memory Size: 8 B
• Supply Voltage (max): 6 V
• Supply Voltage (min): 1 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: Serial
• Package / Case: SOT-96
• Time Format: HH:MM:SS:hh
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: PCF8593T/1,112

NXP Semiconductors
PCF8593
Product data sheet
7.7 Timer
The timer (location 07h) is enabled by setting the control and status register to
XX0X X1XX. The timer counts up from 0 (or a programmed value) to 99. On overflow, the
timer resets to 0. The timer flag (LSB of control and status register) is set on overflow of
the timer. This flag must be reset by software. The inverted value of this flag can be
transferred to the external interrupt by setting bit 3 of the alarm control register.
Additionally, a timer alarm can be programmed by setting the timer alarm enable (bit 6 of
the alarm control register). When the value of the timer equals a pre-programmed value in
the alarm timer register (location 0Fh), the alarm flag is set (bit 1 of the control and status
register). The inverted value of the alarm flag can be transferred to the external interrupt
by enabling the alarm interrupt (bit 6 of the alarm control register).
Resolution of the timer is programmed via the 3 LSBs of the alarm control register (see
Figure
Fig 10. Selection of alarm weekdays
11).
MSB
013aaa375
7
6
All information provided in this document is subject to legal disclaimers.
5
Rev. 04 — 6 October 2010
4
3
2
1
LSB
0
memory location 0Eh (alarm_weekday/month)
weekday 0 enabled when set
weekday 1 enabled when set
weekday 2 enabled when set
weekday 3 enabled when set
weekday 4 enabled when set
weekday 5 enabled when set
weekday 6 enabled when set
not used
Low power clock and calendar
PCF8593
© NXP B.V. 2010. All rights reserved.
10 of 35