c8051f410 Silicon Laboratories, c8051f410 Datasheet - Page 32
c8051f410
Manufacturer Part Number
c8051f410
Description
2.0 V, 32/16 Kb Flash, Smartclock, 12-bit Adc
Manufacturer
Silicon Laboratories
Datasheet
1.C8051F410.pdf
(270 pages)
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C8051F410/1/2/3
1.11. smaRTClock (Real Time Clock)
C8051F41x devices include a smaRTClock Peripheral (Real Time Clock). The smaRTClock has a dedi-
cated 32 kHz oscillator that can be configured for use with or without a crystal, a 47-bit smaRTClock timer
with alarm, a backup supply regulator, and 64 bytes of backup SRAM. When the backup supply voltage
(V
age (V
The smaRTClock allows a maximum of 137 year 47-bit independent time-keeping when used with a
32.768 kHz Watch Crystal and backup supply voltage of at least 1 V. The switchover logic powers smaRT-
Clock from the backup supply when the voltage at V
alarm and missing clock detector can interrupt the CIP-51, wake the internal oscillator from SUSPEND
mode, or generate a device reset if the smaRTClock timer reaches a pre-set value or the oscillator stops.
32
RTC-BACKUP
DD
) is lost.
Backup RAM
Regulator
V
Backup
XTAL4
RTC-BACKUP
) is powered, the smaRTClock peripheral remains fully functional even if the core supply volt-
64B
smaRTClock State Machine
smaRTClock Oscillator
Switchover
Figure 1.10. smaRTClock Block Diagram
Logic
XTAL3
CAPTUREn
RAMADDR
RAMDATA
Registers
RTC0XCN
ALARMn
RTC0CN
Internal
Interrupt
Rev. 1.0
RTC-BACKUP
smaRTClock
smaRTClock
Registers
RTC0ADR
Interface
RTC0KEY
RTC0DAT
is greater than V
47-Bit
Timer
DD
. The smaRTClock
V
DD
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