HT46R652 datasheet(22/47 Pages) HOLTEK

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HT46R652

Rev. 1.00

December 19, 2006

PWM

The microcontroller provides a 16-channel PWM output

shared with pins PC0~PC7 and PD0~PD7. Its output

signals can be configured as (6+2) or (7+1) type de-

pendent upon configuration options. Each PWM chan-

nel has its own 8-bit data register, denoted as

PWM0~PWM15. The PWM frequency source comes

from fSYS. Once the PC0~PC7 and PD0~PD7 pins are

selected as PWM outputs, if the pins are setup as out-

puts, writing a

²1² to the PC0~PC7 and PD0~PD7 data

registers will enable the corresponding PWM output

function, while writing a

²0² will force the PC0~PC7 and

PD0~PD7 pins to remain at

²0².

In the (6+2) mode, the PWM cycle is divided into four

modulation cycles, modulation cycle 0~modulation cy-

cle 3. Each modulation cycle has 64 PWM input clock

periods. In the (6+2) mode, the contents of each PWM

PWM.7~PWM.2. Group 2 is denoted by AC which is the

value of PWM.1~PWM.0.

In the (6+2) mode, the duty cycle of each modulation cy-

cle is shown in the table.

Parameter

AC (0~3)

Duty Cycle

Modulation cycle i

(i=0~3)

i<AC

³AC

The (7+1) mode PWM cycle is divided into two modula-

tion cycles, modulation cycle0~modulation cycle 1.

Each modulation cycle has 128 PWM input clock peri-

ods. In the (7+1) mode, the contents of each PWM reg-

ister is divided into two groups. Group 1 of the PWM

PWM.7~PWM.1. Group 2 is denoted by AC which is the

value of PWM.0.

In the (7+1) mode, the duty cycle of each modulation cy-

cle is shown in the 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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