ATTINY817-MFR. datasheet(124/492 Pages) MICROCHIP

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17.2.2.3 Interrupts

Using the interrupts of this peripheral requires the Interrupt Controller to be configured first.

Related Links

CPUINT - CPU Interrupt Controller

SREG

Interrupts

17.2.2.4 Events

Not applicable.

17.2.2.5 Debug Operation

This peripheral is unaffected by entering debug mode.

The VLM interrupt will not be executed if the CPU is halted in debug mode.

If the peripheral is configured to require periodical service by the CPU through interrupts or similar,

improper operation or data loss may result during halted debugging.

17.3

Functional Description

17.3.1

Initialization

The BOD settings are loaded from fuses during reset. The BOD level and operating mode in Active and

Idle sleep mode are set by fuses and cannot be changed by the CPU. The operating mode in Standby

and Power Down sleep mode is loaded from fuses and can be changed by software.

The Voltage Level Monitor function can be enabled by writing a '1' to the VLM Interrupt Enable bit

(VLMIE) in the Interrupt Control register (BOD.INTCTRL). The VLM interrupt is configured by writing the

VLM Configuration bits (VLMCFG) in BOD.INTCTRL. An interrupt is requested when the supply voltage

crosses the VLM threshold either from above, from below, or from any direction.

The VLM functionality will follow the BOD mode. If the BOD is turned off, the VLM will not be enabled,

even if the VLMIE is '1'. If the BOD is using sampled mode, the VLM will also be sampled. When enabling

VLM interrupt, the interrupt flag will always be set if VLMCFG equals 0x2 and may be set if VLMCFG is

configured to 0x0 or 0x1.

The VLM threshold is defined by writing the VLM Level bits (VLMLVL) in the Control A register

(BOD.VLMCTRLA).

If the BOD/VLM is enabled in sampled mode, only VLMCFG=0x1 (crossing threshold from above) in

BOD.INTCTRL will trigger an interrupt.

17.3.2

Interrupts

Table 17-2. Available Interrupt Vectors and Sources

Offset Name Vector Description

Conditions

0x00

VLM

Voltage Level Monitor Supply voltage crossing the VLM threshold as configured by

VLMCFG in BOD.INTCTRL

When an interrupt condition occurs, the corresponding Interrupt Flag is set in the Interrupt Flags register

of the peripheral (peripheral.INTFLAGS).

An interrupt source is enabled or disabled by writing to the corresponding enable bit in the peripheral's

Interrupt Control register (peripheral.INTCTRL).

ATtiny417/817

Datasheet Complete

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ATTINY817-MFR. Datasheet(PDF) 124 Page - Microchip Technology

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