ATAR092 datasheet(14/107 Pages) ATMEL

14 / 107 page

4535E–4BMCU–05/07

ATAR092/ATAR892

VIM

Voltage Interrupt Mask bit

VIM = 0, voltage monitor interrupt is enabled

VIM = 1, voltage monitor interrupt is disabled

VMS

Voltage Monitor Status bit

VMS = 0, the voltage at the comparator input is below V

Ref

VMS = 1, the voltage at the comparator input is above V

Ref

Figure 4-10. Internal Supply Voltage Supervisor

Figure 4-11. External Input Voltage Supervisor

4.5

Clock Generation

4.5.1

Clock Module

The ATAR092/ATAR892 contains a clock module with 4 different internal oscillator types: two

RC-oscillators, one 4-MHz crystal oscillator and one 32-kHz crystal oscillator. The pins OSC1

and OSC2 are the interface to connect a crystal either to the 4-MHz, or to the 32-kHz crystal

oscillator. OSC1 can be used as input for external clocks or to connect an external trimming

resistor for the RC-oscillator 2. All necessary circuitry except the crystal and the trimming resis-

tor is integrated on-chip. One of these oscillator types or an external input clock can be selected

to generate the system clock (SYSCL).

In applications that do not require exact timing, it is possible to use the fully integrated RC-oscil-

lator 1 without any external components. The RC-oscillator 1 center frequency tolerance is

better than ±50%. The RC-oscillator 2 is a trimmable oscillator whereby the oscillator frequency

can be trimmed with an external resistor attached between OSC1 and V

DD. In this configuration,

the RC-oscillator 2 frequency can be maintained stable with a tolerance of ±15% over the full

operating temperature and voltage range.

VDD

3.0V

2.6V

2.2V

Low Threshold

High Threshold

VMS = 1

Middle Threshold

Low Threshold

High Threshold

Middle Threshold

VMS = 0

VMI

1.3V

Negative Slope

Positive Slope

Interrupt Negative Slope

Interrupt Positive Slope

Internal Reference Level

VMS = 1

VMS = 0

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