HT46R23 datasheet(16/42 Pages) HOLTEK

16 / 42 page

HT46R23

Rev. 1.30

August 17, 2001

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/PD1. If the PWM function is

enabled, the PWM0/PWM1 signal will appear on

PD0/PD1 (if PD0/PD1 is operating in output mode). The

I/O functions of PD0/PD1 are as shown.

I/O

Mode

I/P

(Normal)

O/P

(Normal)

I/P

(PWM)

O/P

(PWM)

PD0

PD1

Logical

Input

Logical

Output

Logical

Input

PWM0

PWM1

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

(dependent on options) bits PWM output shared with

PD0/PD1. The PWM channels have their data registers

denoted as PWM0 (1AH) and PWM1 (1BH). The fre-

quency source of the PWM counter comes from fSYS.

The PWM registers are two 8-bit registers. The wave-

forms of PWM outputs are as shown. Once the

PD0/PD1 are selected as the PWM outputs and the out-

put function of PD0/PD1 are enabled (PDC.0/PDC.1

=²0²), writing 1 to PD0/PD1 data register will enable the

PWM output function and writing ²0² will force the

PD0/PD1 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

i³AC

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.

V DD

PF D E N

(P A 3 )

OP 0 ~ OP 7

TM R f o r P A 4 O n l y

IN T fo r P A 5 O n l y

S y s t em W ak e- up

( P A onl y )

R ead D a t a R egi s t er

PA 3

PF D

(P D 0 o r P W M 0 )

C ont r o l B i t

Da t a B u s

W r i t e C ont r o l R egi s t er

C h i p R es et

R ead C o n t r o l R e g i s t er

W r i t e D a t a R egi s t er

Da t a B i t

PA 0 ~ P A 2

PA 3 / PF D

PA 4 / T M R

PA 5 / I N T

PA 6 , P A7

P B 0/ A N 0~ P B 7/ A N 7

PC 0 ~ PC 5

PD 0 / P W M 0

PD 1 / P W M 1

(P D 1 o r P W M 1 )

Input/output ports

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