PCF8563P NXP Semiconductors, PCF8563P Datasheet - Page 8

• Manufacturer Part Number: PCF8563P
• Manufacturer: NXP Semiconductors

Specifications of PCF8563P

• Bus Type: Serial (2-Wire, I2C)
• Date Format: DW:DM:M:Y
• Time Format: HH:MM:SS
• Operating Supply Voltage (typ): 2.5/3.3/5V
• Package Type: PDIP
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 1.8V
• Operating Temperature Classification: Industrial
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Pin Count: 8
• Mounting: Through Hole
• Lead Free Status / Rohs Status: Compliant

NXP Semiconductors
PCF8563
Product data sheet
Fig 6.
COUNTDOWN COUNTER
When bits TIE and AIE are disabled, pin INT will remain high-impedance.
Interrupt scheme
8.3.2.1 Interrupt output
TE
Bits TF and AF:
timer countdown, TF is set to logic 1. These bits maintain their value until overwritten
using the interface. If both timer and alarm interrupts are required in the application, the
source of the interrupt can be determined by reading these bits. To prevent one flag being
overwritten while clearing another, a logic AND is performed during a write access.
Bits TIE and AIE:
TF or AF is asserted, respectively. The interrupt is the logical OR of these two conditions
when both AIE and TIE are set.
Countdown timer interrupts:
an internal clock and is dependent on the selected source clock for the countdown timer
and on the countdown value n. As a consequence, the width of the interrupt pulse varies
(see
Table 7.
[1]
[2]
Source clock (Hz)
4096
64
1
1
⁄
60
from interface:
from interface:
TF and INT become active simultaneously.
n = loaded countdown value. Timer stops when n = 0.
Table
set alarm
clear AF
clear TF
flag AF
INT operation (bit TI_TP = 1)
7).
All information provided in this document is subject to legal disclaimers.
SET
SET
When an alarm occurs, AF is set to logic 1. Similarly, at the end of a
These bits activate or deactivate the generation of an interrupt when
AF: ALARM
TF: TIMER
CLEAR
CLEAR
FLAG
Rev. 7 — 23 July 2010
INT period (s)
n = 1
1
1
1
1
The pulse generator for the countdown timer interrupt uses
⁄
⁄
⁄
⁄
8192
128
64
64
TRIGGER
GENERATOR 2
[2]
CLEAR
PULSE
[1]
to interface:
read TF
to interface:
read AF
TI_TP
0
1
n > 1
1
1
1
1
⁄
⁄
⁄
⁄
4096
64
64
64
TIE
AIE
Real-time clock/calendar
[2]
013aaa087
PCF8563
© NXP B.V. 2010. All rights reserved.
e.g. AIE
INT
0
1
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