ATAM510 datasheet(18/72 Pages) ATMEL

18 / 72 page

4711B–4BMCU–01/05

ATAM510

Figure 2-13. System Clock Oscillator

2.7.2.5

32-kHz Oscillator

Some applications require accurate long-term time keeping without putting excessive demands

on the CPU or alternatively low resolution computing power. In this case, the on-chip ultra low

power 32-kHz crystal oscillator can be used to generate both the SUBCL and/or the SYSCL. In

this mode, power consumption can be significantly reduced. The 32-kHz crystal oscillator will

key operating (not stopped) during any CPU power-down/SLEEP mode.

Figure 2-14. 32-kHz Crystal Oscillator

Note:

Both, the 4-MHz and the 32-kHz crystal oscillator, use an integrated 14 stage divider circuit to sta-

bilize oscillation before the oscillator output is used as system clock. This results in an additional

delay of about 4 ms for the 4-MHz crystal and about 500 ms for the 32-kHz crystal.

2.7.2.6

Quartz Oscillator Configuration

If the customer’s application necessitates the use of a quartz crystal clock source and this

requires capacitive trimming, the trimming capacitors are not integrated into the MTP unlike the

ATAR510 and should therefore be connected externally as discrete components between the

respective Quartz Crystal terminals (OSCIN, OSCOUT) and VSS.

4-MHz

oscillator

4Out

Stop

4Out

Osc-Stop

OSCIN

OSCOUT

Oscin

Oscout

Cer.

Res

XTAL

32-kHz

oscillator

32Out

OSCIN

OSCOUT

Oscin

Oscout

XTAL

32 kHz

ATAM510 Datasheet(PDF) 18 Page - ATMEL Corporation

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