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PCF85063BTL/1,118

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P48P49-P51P52-P54P55-P57P58-P58
PCF85063BTL All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 6 — 18 November 2015 19 of 58
NXP Semiconductors
PCF85063BTL
Tiny Real-Time Clock/calendar with alarm function and SPI-bus
8.2.4 Register RAM_byte
The PCF85063BTL provides a free RAM byte, which can be used for any purpose, for
example, status byte of the system.
[1] Default value.
8.3 Time and date registers
Most of the registers are coded in the BCD format to simplify application use.
8.3.1 Register Seconds
[1] Default value.
With the offset calibration an accuracy of 2 ppm (0.5 offset per LSB) can be reached (see
Table 13
).
1 ppm corresponds to a time deviation of 0.0864 seconds per day.
(1) 3 correction pulses in MODE = 0 correspond to 13.02 ppm.
(2) 4 correction pulses in MODE = 1 correspond to 16.276 ppm.
(3) Reachable accuracy zone.
Fig 10. Result of offset calibration
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Table 18. RAM_byte - 8-bit RAM register (address 03h) bit description
Bit Symbol Value Description
7 to 0 B[7:0] 00000000
[1]
to
11111111
RAM content
Table 19. Seconds - seconds register (address 04h) bit description
Bit Symbol Value Place value Description
7OS oscillator stop
0 - clock integrity is guaranteed
1
[1]
- clock integrity is not
guaranteed; oscillator has
stopped or has been
interrupted
6to4 SECONDS 0
[1]
to 5 ten’s place actual seconds coded in BCD
format, see Table 20
3 to 0 0
[1]
to 9 unit place
PCF85063BTL All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 6 — 18 November 2015 20 of 58
NXP Semiconductors
PCF85063BTL
Tiny Real-Time Clock/calendar with alarm function and SPI-bus
[1] Default value.
8.3.1.1 OS flag: Oscillator stop
When the oscillator of the PCF85063BTL is stopped, the OS flag is set. The oscillator can
be stopped, for example, by connecting one of the oscillator pins OSCI or OSCO to
ground. The oscillator is considered to be stopped during the time between power-on and
stable crystal resonance. This time can be in the range of 200 ms to 2 s depending on
crystal type, temperature, and supply voltage.
The flag remains set until cleared by command (see Figure 11
). If the flag cannot be
cleared, then the oscillator is not running. This method can be used to monitor the
oscillator and to determine if the supply voltage has reduced to the point where oscillation
fails.
Table 20. Seconds coded in BCD format
Seconds value in
decimal
Upper-digit (ten’s place) Digit (unit place)
Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
00
[1]
0000000
01 0000001
02 0000010
: :::::::
09 0001001
10 0010000
: :::::::
58 1011000
59 1011001
Fig 11. OS flag
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PCF85063BTL All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 6 — 18 November 2015 21 of 58
NXP Semiconductors
PCF85063BTL
Tiny Real-Time Clock/calendar with alarm function and SPI-bus
8.3.2 Register Minutes
[1] Default value.
8.3.3 Register Hours
[1] Hour mode is set by the 12_24 bit in register Control_1.
[2] Default value.
8.3.4 Register Days
[1] If the year counter contains a value, which is exactly divisible by 4 (including the year 00), the
PCF85063BTL compensates for leap years by adding a 29th day to February.
[2] Default value.
[3] Default value is 1.
8.3.5 Register Weekdays
Table 21. Minutes - minutes register (address 05h) bit description
Bit Symbol Value Place value Description
7 - 0 - unused
6to4 MINUTES 0
[1]
to 5 ten’s place actual minutes coded in BCD
format
3 to 0 0
[1]
to 9 unit place
Table 22. Hours - hours register (address 06h) bit description
Bit Symbol Value Place value Description
7 to 6 - 00 - unused
12 hour mode
[1]
5AMPM AM/PM indicator
0
[2]
-AM
1- PM
4 HOURS 0
[2]
to 1 ten’s place actual hours in 12 hour mode
coded in BCD format
3to0 0
[2]
to 9 unit place
24 hour mode
[1]
5 to 4 HOURS 0
[2]
to 2 ten’s place actual hours in 24 hour mode
coded in BCD format
3to0 0
[2]
to 9 unit place
Table 23. Days - days register (address 07h) bit description
Bit Symbol Value Place value Description
7 to 6 - 00 - unused
5to4 DAYS
[1]
0
[2]
to 3 ten’s place actual day coded in BCD format
3to0 0
[3]
to 9 unit place
Table 24. Weekdays - weekdays register (address 08h) bit description
Bit Symbol Value Description
7 to 3 - 00000 unused
2to0 WEEKDAYS 0to6 actual weekday values, see Table 25
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P48P49-P51P52-P54P55-P57P58-P58

PCF85063BTL/1,118

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NXP Semiconductors
Description:
Real Time Clock Low Power Real time clocks
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