SI4010-C2-GS View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

SI4010-C2-GS

CRYSTAL-LESS SOC RF TRANSMITTER

Silicon Laboratories 

Si4010-C2

33. Real Time Clock Timer

The Si4010 device contains a real time clock (RTC) timer. This dedicated timer provides accurate interrupt

request pulses in precise time intervals. The device does not contain any hardware nor any battery backed

up real time clock. The purpose of RTC timer is to provide accurate time intervals for user application at

run time, not an absolute real calendar time.

The RTC timer clock source is the internal calibrated system clock generator. The RTC constant tick gen-

erator runs from the selected divided internal system clock, which is a power of two division of the 24 MHz

internal oscillator. The frequency ranges from 24 MHz down to 24 MHz/128. The RTC tick generated is a

constant frequency of 24 MHz/128 with tick period 5.33 µs and is independent of the system clock division

setting SYSGEN_DIV in the SYSGEN SFR register.

The user can select what exact time intervals the RTC timer will set its interrupt flag. The time interval is

programmable to be one of the following: 100 µs, 200 µs, 400 µs, 800 µs, 1 ms, 2 ms, and 5 ms. This time

is independent of the selected system clock divider in the SYSGEN SFR register.

SYSGEN

OSC

24MHz clk_osc

clk_sys

CLKC

24MHz ... 24MHz/128

rtc_tick

5.33us

RTC Tick

rtc_tick

To TMR2 & 3

RTC

RTC_INT

RTC_ENA

RTC_CLR

RTC_DIV

Figure 33.1. RTC Timer Block Diagram

Interrupt

128

Rev. 1.0

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