PCF85063BTL Datasheet, PDF (27/53 Pages) NXP Semiconductors – Tiny Real-Time Clock/calendar with alarm function and SPI-bus

NXP Semiconductors
PCF85063BTL
Tiny Real-Time Clock/calendar with alarm function and SPI-bus
8.6 Timer registers
The 8-bit countdown timer at address 10h is controlled by the register Timer_mode at
address 11h.
8.6.1 Register Timer_value
Table 34. Timer_value - timer value register (address 10h) bit description
Bit
Symbol
Value
Description
7 to 0 T[7:0]
0h^[1] to
FFh
countdown timer value^[2]
[1] Default value.
[2] Countdown period in seconds: CountdownPeriod = ------------------------------^T-------------------------------- where T is the
countdown value.
SourceClockFrequency
8.6.2 Register Timer_mode
Table 35. Timer_mode - timer control register (address 11h) bit description
Bit
Symbol
Value
Description
7 to 5 -
000
unused
4 to 3 TCF[1:0]
timer clock frequency
00
4.096 kHz timer source clock
01
64 Hz timer source clock
10
1 Hz timer source clock
2
TE
11^[1]
1_{⁄60 Hz timer source clock}
timer enable
0^[1]
timer is disabled
1
timer is enabled
1
TIE
timer interrupt enable
0^[1]
no interrupt generated from timer
1
interrupt generated from timer
0
TI_TP^[2]
timer interrupt mode
0^[1]
interrupt follows timer flag
1
interrupt generates a pulse
[1] Default value.
[2] How the setting of TI_TP and the timer flag TF can affect the INT pulse generation is explained in
Section 8.2.2.3 on page 12.
8.6.3 Timer functions
The timer has four selectable source clocks allowing for countdown periods in the range
from 244 s to 4 hours 15 min. For periods longer than 4 hours, the alarm function can be
used.
PCF85063BTL
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 15 April 2013
© NXP B.V. 2013. All rights reserved.
27 of 53