ATAR080 datasheet(16/68 Pages) ATMEL

16 / 68 page

ATAR080

4675D–4BMCU–12/04

RC-oscillator 2 with External

Trimming Resistor

The RC-oscillator 2 is a high resolution trimmable oscillator whereby the oscillator fre-

quency can be trimmed with an external resistor between OSC1 and VSS. In this

configuration, the RC-oscillator 2 frequency can be maintained stable to within a toler-

ance of ±15% over the full operating temperature and voltage range from V

DD = 2.0 V to

6.5 V.

For example: An output frequency at the RC-oscillator 2 of 1.6 MHz, can be obtained by

connecting a resistor R

ext = 47 kΩ (see Figure 17).

Figure 17. RC-oscillator 2

4-MHz Oscillator

The ATAR080 4-MHz oscillator options need a crystal or ceramic resonator connected

to the OSC1 and OSC2 pins to establish oscillation. All the necessary oscillator circuitry

is integrated, with the exception of the actual crystal, resonator and the capacitors C

and C

Figure 18. 4-MHz Crystal Oscillator

Note:

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

cuit to stabilize 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.

RC-oscillator 2

RcOut2

Stop

RcOut2

Osc-Stop

Trim

OSC1

ext

4-MHz

oscillator

4Out

Stop

4Out

Osc-Stop

OSC1

OSC2

Oscin

Oscout

XTAL

4 MHz

ATAR080 데이터시트(PDF) 16 Page - ATMEL Corporation

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