HT46C64 datasheet(21/47 Pages) HOLTEK

21 / 47 page

HT46R64/HT46C64

Rev. 1.40

September 21, 2004

data register will enable the PWM output function and

writing

²0² will force the PD0/PD1/PD2/PD3 to stay at

²0².

A (6+2) bits mode PWM cycle is divided into four modu-

lation cycles (modulation cycle 0~modulation cycle 3).

Each modulation cycle has 64 PWM input clock period.

In a (6+2) bit PWM function, the contents of the PWM

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

DC+1

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

DC+1

128

³AC

128

The modulation frequency, cycle frequency and cycle

duty of the PWM output signal are summarized in the

following table.

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

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

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