MAXQ2000-RFX+ datasheet(26/39 Pages) MAXIM

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Low-Power LCD Microcontroller

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MAXQ2000

CLOCK

DIVIDER

SELECTOR

WAKE-UP

ALARM

TIMERS

DEFAULT

RING SELECT

WATCHDOG

TIMER

RESET DOG

RWT

RESET

POWER-ON

RESET

STOP

POWER-ON

RESET

SWB

INTERRUPT/SERIAL PORT

RESET

STOP

RGSL

XDOG DONE

RGMD

POWER-ON RESET

WATCHDOG RESET

CLOCK

GENERATION

SYSTEM CLOCK

ENABLE

WATCHDOG INTERRUPT

RING

ENABLE

32kHz

CRYSTAL

MONITOR

ENABLE

INPUT

CRYSTAL

CRYSTAL KLL

XDOG

STARTUP

TIMER

CLK INPUT

RESET

XDOG COUNT

XDOG DONE

Figure 2. Clock Sources

System Timing

For maximum versatility, the MAXQ2000 generates its

internal system clock from one of five possible sources:

• Internal ring oscillator

• External high-frequency crystal or ceramic resonator,

using an internal oscillator

• External high-frequency clock source

• External 32kHz crystal or ceramic resonator, using an

internal oscillator

• External 32kHz clock source

A crystal warmup counter enhances operational relia-

bility. Each time the external crystal oscillation must

restart, such as after exiting Stop mode, the device initi-

ates a crystal warmup period of 65,536 oscillations.

This allows time for the crystal amplitude and frequency

to stabilize before using it as a clock source. While in

the warmup mode, the device can begin operation from

the internal ring oscillator and automatically switch

back to the crystal as soon as it is ready.

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