ATAR080 datasheet(13/68 Pages) ATMEL

13 / 68 page

ATAR080

4675D–4BMCU–12/04

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 12. Internal Supply Voltage Supervisor

Figure 13. External Input Voltage Supervisor

Clock Generation

Clock Module

The ATAR080 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 crys-

tal 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 GND. In this configuration, the RC-oscillator 2 frequency can be maintained stable

to within a tolerance of ±15% over the full operating temperature and voltage range.

2.15 V

Low threshold

High threshold

VMS = 1

Low threshold

High threshold

VMS = 0

2.95 V

2.55 V

1.25 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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