ST72371 datasheet(71/94 Pages) STMICROELECTRONICS

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ST72371/ST72372

PWM/BRM GENERATOR (Cont’d)

4.6.3.2 12-Bit PWM/BRM

The 12 bits of the 12-bit PWM/BRM generator are

distributed as 6 PWM bits and 6 BRM bits.

PWM Generation

The functionality of the PWM generation is equiva-

lent to the PWM generation of the 10-bit PWM/

BRM described in the previous paragraph and so

will not be repeated here. Please refer to the pre-

vious paragraph for functionality, to be used in

conjunction with the Register description.

BRM Generation

A 6-bit BRM register defining the intervals where

an incremental pulse (with duration of TCPU)is

added to the beginning of the original PWM pulse.

4.6.3.3 PWM/BRM OUTPUTS

The PWM/BRM outputs are assigned to dedicated

pins.

If necessary, these pins can be used in push-pull

or open-drain modes under software control.

In these pins, the PWM/BRM outputs are connect-

ed to a serial resistor which must be taken into ac-

count to calculate the RC filter.

Figure 33. Precision for PWM/BRM Tuning for VOUTEFF (After filtering)

BRM 6 - Bit Data

Incremental Pulse Intervals

000000

none

000001

i = 32

000010

i = 16,48

000100

i = 8,24,40,56

001000

i = 4,12,20,28,36,44,52,60

010000

i = 2,6,10,...50,54,58,62

100000

i = 1,3,5,7,9,...55,59,61,63

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