HT46R65 datasheet(21/48 Pages) HOLTEK

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HT46R65/HT46C65

Rev. 1.80

July 14, 2005

PWM

The microcontroller provides 4 channels (6+2)/(7+1)

(dependent on options) bits PWM output shared with

PD0/PD1/PD2/PD3. The PWM channels have their data

registers denoted as PWM0 (1AH), PWM1 (1BH),

PWM2 (1CH) and PWM3 (1DH). The frequency source

of the PWM counter comes from fSYS. The PWM regis-

ters are four 8-bit registers. The waveforms of PWM out-

puts are as shown. Once the PD0/PD1/PD2/PD3 are

selected as the PWM outputs and the output function of

PD0/PD1/PD2/PD3 are enabled (PDC.0/PDC.1/

PDC.2/PDC.3=

²0²), writing ²1² to PD0/PD1/PD2/PD3

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.

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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