MEC1404 Datasheet, PDF (396/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

MEC140X/1X
Offset ^04h
Bits
Description
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
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
Type
R
R/W
R/W
Default
-
0h
Reset
Event
-
nSYSR
ST
0h
nSYSR
ST
In blinking mode, this field defines the duty cycle of the blink function.
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 ^08h
Bits
Description
Type
31:24 Reserved
R
23:12 HIGH_DELAY
R/W
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.
Default
-
000h
Reset
Event
-
nSYSR
ST
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
11:0 LOW_DELAY
R/W
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.
000h
nSYSR
ST
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
28.10.4 LED UPDATE STEPSIZE REGISTER
This register has eight segment fields which provide the amount the current duty cycle is adjusted at the end of every
PWM period. Segment field selection is decoded based on the segment index. The segment index equation utilized
depends on the SYMMETRY bit in the LED Configuration Register Register).
DS00001956D-page 396
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