HT49CV7 datasheet(25/48 Pages) HOLTEK

25 / 48 page

HT49RV7/HT49CV7

Rev. 1.00

April 20, 2006

PWM.7~PWM.2.

The group 2 is denoted by AC which is the value of

PWM.1~PWM.0.

In a (6+2) bits mode PWM cycle, the duty cycle of each

modulation cycle is shown in the table.

Parameter

AC (0~3)

Duty Cycle

Modulation cycle i

(i=0~3)

i<AC

³AC

A (7+1) bits mode PWM cycle is divided into two modu-

lation cycles (modulation cycle0~modulation cycle 1).

Each modulation cycle has 128 PWM input clock period.

In a (7+1) bits PWM function, the contents of the PWM

PWM.7~PWM.1.

The group 2 is denoted by AC which is the value of

PWM.0.

In a (7+1) bits mode PWM cycle, the duty cycle of each

modulation cycle is shown in the table.

Parameter

AC (0~1)

Duty Cycle

Modulation cycle i

(i=0~1)

i<AC

128

³AC

128

The modulation frequency, cycle frequency and cycle

duty of the PWM output signal are summarized in the

following table.

PWM

Modulation Frequency

PWM Cycle

Frequency

PWM Cycle

Duty

fSYS/64 for (6+2) bits mode

fSYS/128 for (7+1) bits mode

fSYS/256

[PWM]/256

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

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

2 5 / 6 4

2 6 / 6 4

2 5 / 6 4

2 6 / 6 4

2 5 / 6 4

2 6 / 6 4

2 5 / 6 4

2 6 / 6 4

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

P W M m o d u l a t i o n p e r i o d : 6 4 / 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 2

M o d u l a t i o n c y c l e 3

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

(6+2) PWM Mode

HT49CV7 Datasheet(PDF) 25 Page - Holtek Semiconductor Inc

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