C8051F93X-C8051F92X 查看數據表（PDF） - Silicon Laboratories

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C8051F93X-C8051F92X

Single/Dual Battery, 0.9–3.6 V, 64/32 kB, SmaRTClock, 10-Bit ADC MCU

Silicon Laboratories 

C8051F93x-C8051F92x

20. SmaRTClock (Real Time Clock)

C8051F93x-C8051F92x devices include an ultra low power 32-bit SmaRTClock Peripheral (Real Time

Clock) with alarm. The SmaRTClock has a dedicated 32 kHz oscillator that can be configured for use with

or without a crystal. No external resistor or loading capacitors are required. The on-chip loading capacitors

are programmable to 16 discrete levels allowing compatibility with a wide range of crystals. The SmaRT-

Clock can operate directly from a 0.9–3.6 V battery voltage and remains operational even when the device

goes into its lowest power down mode.

The SmaRTClock allows a maximum of 36 hour 32-bit independent time-keeping when used with a

32.768 kHz Watch Crystal. The SmaRTClock provides an Alarm and Missing SmaRTClock events, which

could be used as reset or wakeup sources. See Section “18. Reset Sources” on page 184 and Section

“14. Power Management” on page 159 for details on reset sources and low power mode wake-up sources,

respectively.

XTAL4

XTAL3

Programmable Load Capacitors

SmaRTClock Oscillator

SmaRTClock

32-Bit

SmaRTClock

Timer

Power/

Clock

Mgmt

SmaRTClock State Machine

Wake-Up

Interrupt

Internal

Registers

CAPTUREn

RTC0CN

RTC0XCN

RTC0XCF

RTC0PIN

ALARMn

Interface

Registers

RTC0KEY

RTC0ADR

RTC0DAT

Figure 20.1. SmaRTClock Block Diagram

200

Rev. 1.3

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