USB5537B datasheet(39/79 Pages) MICROCHIP

39 / 79 page

 2012 - 2015 Microchip Technology Inc.

DS00001682C-page 39

USB5537B

Although the device can send out 128 bytes of memory data, it isn’t necessary to read the entire set, the SMBus Master

can send a stop at any time.

5.6.2

LED0/PIO0 REGISTER 1

5.6.3

LED0/PIO0 REGISTER 2

TABLE 5-19:

LED0/PIO0 REGISTER 1

LED0_CTL1

(0X0806)

LED0_PIO0 Control Register

Bit

Name

R/W

Description

XNOR

R/W

This bit toggles the polarity of the LED output. It can be used to invert the

polarity.

MODE

R/W

0 - Blink the LED.

1 - Breath the LED.

5:0

RATE

R/W

In Blink mode: This is the Blink Rate of LED in 50 ms increments. Duty

cycle of 50%. Rate range is 50 ms to 3.15 seconds.

In Breath mode: This is the time for an active breadth in 500 ms

increments.

TABLE 5-20:

LED0/PIO0 REGISTER 2

LED0_CTL2

(0X0807)

LED0_PIO0 Control Register 2

Bit

Name

R/W

Description

7:2

TRAILOFF_TIME

R/W

In Blink mode: Time the LED must continue blinking after LED_ON is

turned off. TRAIL_TIME is in 50ms increments. Range is 50 ms to 3.15

seconds.

In Breath mode: This is the time for an sleeping in between breadths in

500 ms increments

LED_ON

R/W

If LED_ON is set, then start blinking or breathing this LED.

Blink timer starts when this bit is enabled. No short blinks permitted.

When this bit is disabled, blinking stops when TRAIL_TIME expires.

In Breath Mode: Breath timer starts when this bit is enabled. No short

blinks permitted. When this bit is disabled, blinking stops immediately.

LED_PIO

R/W

‘0’ = PIO0

‘1’ = LED0

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