PCF8563T NXP Semiconductors, PCF8563T Datasheet - Page 16

• Manufacturer Part Number: PCF8563T
• Manufacturer: NXP Semiconductors

Specifications of PCF8563T

• Bus Type: Serial (2-Wire, I2C)
• Operating Supply Voltage (typ): 2.5/3.3/5V
• Package Type: SO
• 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: Surface Mount
• Date Format: DW:DM:M:Y
• Time Format: HH:MM:SS
• Lead Free Status / RoHS Status: Compliant

NXP Semiconductors
PCF8563
Product data sheet
8.8.1 Register Timer_control
8.8 Timer function
Table 22.
[1]
The 8-bit countdown timer at address 0Fh is controlled by the Timer_control register at
address 0Eh. The Timer_control register determines one of 4 source clock frequencies for
the timer (4096 Hz, 64 Hz, 1 Hz, or
counts down from a software-loaded 8-bit binary value. At the end of every countdown,
the timer sets the timer flag TF. The TF may only be cleared by using the interface. The
asserted TF can be used to generate an interrupt on pin INT. The interrupt may be
generated as a pulsed signal every countdown period or as a permanently active signal
which follows the state of TF. Bit TI_TP is used to control this mode selection. When
reading the timer, the current countdown value is returned.
Table 23.
[1]
[2]
Bit
7
6 to 2 -
1 to 0 FD[1:0]
Bit
7
6 to 2 -
1 to 0 TD[1:0]
Default value.
Default value.
These bits determine the source clock for the countdown timer; when not in use, TD[1:0] should be set to
1
⁄
60
Symbol
FE
Symbol
TE
Hz for power saving.
CLKOUT_control - CLKOUT control register (address 0Dh) bit description
Timer_control - timer control register (address 0Eh) bit description
All information provided in this document is subject to legal disclaimers.
Rev. 7 — 23 July 2010
Value
0
1
-
00
01
10
11
Value
0
1
-
00
01
10
11
[1]
[1]
[2]
[1]
1
⁄
60
Description
the CLKOUT output is inhibited and CLKOUT output is
set to logic 0
the CLKOUT output is activated
unused
frequency output at pin CLKOUT
Description
timer is disabled
timer is enabled
unused
timer source clock frequency select
Hz), and enables or disables the timer. The timer
32.768 kHz
1.024 kHz
32 Hz
1 Hz
4.096 kHz
64 Hz
1 Hz
1
⁄
60
Hz
Real-time clock/calendar
[2]
PCF8563
© NXP B.V. 2010. All rights reserved.
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