HT46C22 datasheet(16/46 Pages) HOLTEK

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HT46R22/HT46C22

Rev. 1.10

October 2, 2002

lected, the PFD output signal is controlled by PA3 data

²1² to PA3 data register will enable

the PFD output function and writing

²0² will force the

PA3 to remain at

²0². The I/O functions of PA3 are

shown below.

I/O

Mode

I/P

(Normal)

O/P

(Normal)

I/P

(PFD)

O/P

(PFD)

PA3

Logical

Input

Logical

Output

Logical

Input

PFD

(Timer on)

Note:

The PFD frequency is the timer/event counter

overflow frequency divided by 2.

The PA5 and PA4 are pin-shared with INT and TMR pins

respectively.

The PB can also be used as A/D converter inputs. The

A/D function will be described later. There is a PWM

function shared with PD0. If the PWM function is en-

abled, the PWM signal will appear on PD0 (if PD0 is op-

erating in output mode). Writing

²1² to PD0 data register

will enable the PWM output function and writing

²0² will

force the PD0 to remain at

²0². The I/O functions of PD0

is as shown.

I/O

Mode

I/P

(Normal)

O/P

(Normal)

I/P

(PWM)

O/P

(PWM)

PD0

Logical

Input

Logical

Output

Logical

Input

PWM

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 1 channels (6+2)/(7+1)

(dependent on options) bits PWM output shared with

PD0. The PWM channel has its data registers denoted

as PWM(1AH). The frequency source of the PWM coun-

ter comes from fSYS. The PWM registers is a 8-bit regis-

ter. The waveforms of PWM outputs are as shown.

Once the PD0 is selected as the PWM outputs and the

output function of PD0 is enabled (PDC.0=

²0²), writing 1

to PD0 data register will enable the PWM output func-

tion and writing

²0² will force the PD0 to stay at ²0².

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

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

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

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

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

(7+1) PWM mode

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