HT46C232 datasheet(18/50 Pages) HOLTEK

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HT46R232/HT46C232

Rev. 1.40

November 23, 2005

I/O

Mode

I/P

(Normal)

O/P

(Normal)

I/P

(PWM)

O/P

(PWM)

PD0~

PD3

Logical

Input

Logical

Output

Logical

Input

PWM0~

PWM3

It is recommended that unused or not bonded out I/O

lines should be set as output pins by software instruction

to avoid consuming power under input floating state.

PWM

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

pends 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 registers are

four 8-bit registers. The waveforms of PWM outputs are as

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

PWM

outputs

and

the

output

function

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 writ-

ing

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

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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