HT46R01 datasheet(25/60 Pages) HOLTEK

25 / 60 page

HT46R01/HT46R02/HT46R03

Rev. 1.00

September 21, 2007

7+1 PWM Mode

Each full PWM cycle, as it is controlled by an 8-bit PWM

PWM mode, each PWM cycle is subdivided into two indi-

vidual sub-cycles known as modulation cycle 0 ~ modula-

tion cycle 1, denoted as i in the table. Each one of these

two sub-cycles contains 128 clock cycles. In this mode, a

modulation frequency increase of two is achieved. The

8-bit PWM register value, which represents the overall

duty cycle of the PWM waveform, is divided into two

groups. The first group which consists of bit1~bit7 is de-

noted here as the DC value. The second group which

consists of bit0 is known as the AC value. In the 7+1

PWM mode, the duty cycle value of each of the two mod-

ulation sub-cycles is shown in the following table.

Parameter

AC (0~1)

(Duty Cycle)

Modulation cycle i

(i=0~1)

i<AC

DC+1

128

³AC

128

7+1 Mode Modulation Cycle Values

The following diagram illustrates the waveforms associ-

ated with the 7+1 mode PWM operation. It is important

to note how the single PWM cycle is subdivided into 2 in-

dividual modulation cycles, numbered 0 and 1 and how

the AC value is related to the PWM value.

P W M R e g i s t e r

( 6 + 2 ) M o d e

b 7

b 0

A C v a l u e

D C v a l u e

PWM Register for 6+2 Mode

f S Y S / 2

P W M

[ P W M ] = 1 0 0

[ P W M ] = 1 0 1

P W M

[ P W M ] = 1 0 2

P W M

[ P W M ] = 1 0 3

P W M

P W M m o d u l a t i o n p e r i o d : 1 2 8 / f S Y S

5 0 / 1 2 8

5 1 / 1 2 8

5 2 / 1 2 8

5 0 / 1 2 8

5 1 / 1 2 8

5 0 / 1 2 8

5 1 / 1 2 8

5 2 / 1 2 8

M o d u l a t i o n c y c l e 0

P W M c y c l e : 2 5 6 / f S Y S

M o d u l a t i o n c y c l e 1

M o d u l a t i o n c y c l e 0

7+1 PWM Mode

P W M R e g i s t e r

( 7 + 1 ) M o d e

b 7

b 0

A C v a l u e

D C v a l u e

PWM Register for 7+1 Mode

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