MCP795W21 datasheet(17/54 Pages) MICROCHIP

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 2011-2012 Microchip Technology Inc.

Preliminary

DS22280C-page 17

MCP795W1X/MCP795W2X

EVENT DETECT 0X0B

R/W

EVHIF

EVLIF

EVEN1

EVEN0

EVWDT

EVLDB

EVHS1

EVHS0

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

bit 7

EVHIF: High-Speed Event Interrupt Flag bit

When the configured number of high-speed events has occurred, the IRQ pin is asserted and the

EVHIF bit is set in hardware. To clear the interrupt and the IRQ pin the EVHIF bit must be cleared in

software.

bit 6

EVLIF: Low-Speed Event Interrupt Flag bit

When an event occurs on the low-speed pin, this IRQ pin is asserted and the EVLIF bit is set. This bit

must be cleared by software to reset the module and clear the IRQ pin.

bit 5:4

EVEN<1:0>: Event Detect Configuration bits

These two bits determine what combination of the high and low-speed modules are enabled.

- 00 – Both modules are Off

- 01 – Low-speed module enabled, high speed disabled

- 10 – Low-speed module disabled, high speed enabled

- 11 – Both modules are enabled

bit 3

EVWDT: EVHS Watchdog Timer Reset Enable bit

Setting this bit overrides any setting for the High-Speed Event Detection and allows the EVHS pin to

clear the Watchdog Timer. This is edge triggered. Either an H-L or L-H transition will clear the WDT.

bit 2

EVLDB: Low-Speed Event Detect Debounce Configuration bit

This is the Low-Speed Event Debounce setting. Depending on the state of this bit, the low-speed pin

will have to remain at the same state for the following periods to be considered valid.

- 0 – 31.25 ms

- 1 – 500 ms

bit 1-0

EVHS<1:0>: High-Speed Event Detect Configuration bits

Determines how many high-speed events must occur before the EVHIF bit is set.

All of these events must occur within 250 ms (based on the uncalibrated 32.768 kHz clock).

- 00 – 1st Event

- 01 – 4th Event

- 10 – 16th Event

- 11 – 32nd Event

Note 1:

Please see Section 9.1.4, Event Detection for more information.

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