pcf8563 NXP Semiconductors, pcf8563 Datasheet - Page 7

• Manufacturer Part Number: pcf8563
• Description: Real-time Clock/calendar
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCF8563_5
Product data sheet
7.6.3 Time and date registers
Bits TIE and AIE: These bits activate or deactivate the generation of an interrupt when
TF or AF is asserted, respectively. The interrupt is the logical OR of these two conditions
when both AIE and TIE are set.
Table 5.
Table 6.
[1]
[2]
Table 7.
Table 8.
Bit
7 to 5
4
3
2
1
0
Source clock (Hz)
4096
64
1
1 60
Bit
7
6 to 0
Bit
6 to 0
TF and INT become active simultaneously.
n = loaded countdown value. Timer stopped when n = 0.
Symbol
0
TI/TP
AF
TF
AIE
TIE
Symbol
VL
SECONDS 00 to 59
Symbol
MINUTES 00 to 59
Control/status 2 (address 01h) bits description
INT operation (bit TI/TP = 1)
Seconds/VL (address 02h) bits description
Minutes (address 03h) bits description
Value
0
1
0 (read)
1 (read)
0 (write)
1 (write)
0 (read)
1 (read)
0 (write)
1 (write)
0
1
0
1
Value
Value
0
1
Rev. 05 — 17 July 2007
Description
default value is logic 0
INT is active when TF is active (subject to the status of TIE)
INT pulses active according to
TIE); note that if AF and AIE are active then INT will be
permanently active
alarm flag inactive
alarm flag active
alarm flag is cleared
alarm flag remains unchanged
timer flag inactive
timer flag active
timer flag is cleared
timer flag remains unchanged
alarm interrupt disabled
alarm interrupt enabled
timer interrupt disabled
timer interrupt enabled
INT period (s)
n = 1
1 8192
1 128
1 64
1 64
Description
this register holds the current minutes coded in BCD format
Description
clock integrity is guaranteed
integrity of the clock information is no longer guaranteed
this register holds the current seconds coded in BCD format;
example: seconds register contains x101 1001 = 59 seconds
[2]
[1]
Table 6
n > 1
1 4096
1 64
1 64
1 64
Real time clock/calendar
(subject to the status of
PCF8563
© NXP B.V. 2007. All rights reserved.
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