STMPE821 datasheet(46/55 Pages) STMICROELECTRONICS

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Basic PWM controller

STMPE821

46/55

PWM_CTRL_n

PWM control register n=0-3

Address:

0xB1, 0xB5, 0xB9, 0xBD

Type:

R/W

Reset:

0x00

Description:

This register controls the sequence and repetition of blinking.

765

PERIOD_0

PERIOD_1

REPETITION

FRAME_ORDER

[7:6] PERIOD_0:

This defines the ON period time which is when the PWM channel output is toggling. The time

unit is as defined in the TIMING bits of the respective TIMING_SETUP registers:

00: 1 time unit

01: 2 time unit

10: 3 time unit

11: 4 time unit

[5:4] PERIOD_1:

This defines the OFF period time which is when the PWM channel output is low, that is, not

toggling. The time unit is as defined in the TIMING bits of the respective TIMING_SETUP

registers:

00: 0 time unit. This means that there is no OFF period but only ON period, that is, the PWM

channel output will always be toggling.

01: 1 time unit

10: 2 time unit

11: 3 time unit

[3:1] REPETITION:

This defines the number of repetition of pairs of PERIOD_0 and PERIOD_1.

000: infinite repetition.

001: execute only one pair.

010: execute 2 pairs

011: execute 3 pairs

100: execute 4 pairs

101: execute 5 pairs

110: execute 6 pairs

111: execute 7 pairs

[0] FRAME_ORDER:

For PWM mode, this defines which frame, PERIOD_0 or PERIOD_1 comes first.

0: PERIOD_0 is outputted first then PERIOD_1.

1: PERIOD_1 is outputted first then PERIOD_0.

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