MEC1322 datasheet(339/456 Pages) MICROCHIP

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DS00001719D-page 339

MEC1322

28.10.3

LED DELAY REGISTER

This register may be written at any time. Values written into the register are held in an holding register, which is trans-

ferred into the actual register at the end of a PWM period if the Enable Update bit in the LED Configuration register is

set to 1. Reads of this register return the current contents and not the value of the holding register.

Offset

04h

Bits

Description

Type

Default

Reset

Event

31:16 Reserved

15:8 MAXIMUM

In breathing mode, when the current duty cycle is greater than or

equal to this value the breathing apparatus holds the current duty

cycle for the period specified by the field HD in register LED_DELAY,

then starts decrementing the current duty cycle

R/W

VCC1_

RESET

7:0 MINIMUM

In breathing mode, when the current duty cycle is less than or equal

to this value the breathing apparatus holds the current duty cycle for

the period specified by the field LD in register LED_DELAY, then

starts incrementing the current duty cycle

In blinking mode, this field defines the duty cycle of the blink function.

R/W

VCC1_

RESET

Offset

08h

Bits

Description

Type

Default

Reset

Event

31:24 Reserved

23:12 HIGH_DELAY

In breathing mode, the number of PWM periods to wait before updat-

ing the current duty cycle when the current duty cycle is greater than

or equal to the value MAX in register LED_LIMIT.

4095=The current duty cycle is decremented after 4096 PWM periods

…

1=The delay counter is bypassed and the current duty cycle is decre-

mented after two PWM period

0=The delay counter is bypassed and the current duty cycle is decre-

mented after one PWM period

R/W

000h

VCC1_

RESET

11:0 LOW_DELAY

The number of PWM periods to wait before updating the current duty

cycle when the current duty cycle is greater than or equal to the value

MIN in register LED_LIMIT.

4095=The current duty cycle is incremented after 4096 PWM periods

…

0=The delay counter is bypassed and the current duty cycle is incre-

mented after one PWM period

In blinking mode, this field defines the prescalar for the PWM clock

R/W

000h

VCC1_

RESET

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