ATAR092 datasheet(13/100 Pages) ATMEL

13 / 100 page

ATAR092/ATAR892

4535C–4BMCU–02/04

VIM

oltage Interrupt Mask bit

VIM = 0, voltage monitor interrupt is enabled

VIM = 1, voltage monitor interrupt is disabled

VMS

oltage 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 12.

Internal Supply Voltage Supervisor

Figure 13.

External Input Voltage Supervisor

Clock Generation

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 con-

nect an external trimming resistor for the RC-oscillator 2. All necessary circuitry except

the crystal and the trimming resistor 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-oscillator 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.

Low threshold

Middle threshold

High threshold

VMS = 1

Low threshold

Middle threshold

High threshold

VMS = 0

3.0 V

2.6 V

2.2 V

1.3 V

VMI

VMS = 1

VMS = 0

Positive slope

Negative slope

VMS = 1

VMS = 0

Interrupt negative slope

Interrupt positive slope

Internal reference level

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