HT45RM03 datasheet(20/54 Pages) HOLTEK

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HT45RM03

Rev. 1.10

February 16, 2007

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

PWMH

PWML

¾¾¾¾¾¾

PWMH (1AH), PWML (1BH) Register

A (9+1) bits mode PWM cycle is divided into two modulation cycles (modulation cycle 0~modulation cycle 1). Each

modulation cycle has 512 PWM input clock period. In a (9+1) bit PWM function, the contents of the PWM register is di-

vided into two groups. Group 1 of the PWM registers are denoted by DC which are the values of PWMH.7~PWMH.0

and PWML.1 (9 bit from PWMH~PWML.1). The group 2 is denoted by AC which is the value of PWML.0. In a (9+1) bits

mode PWM cycle, the duty cycle of each modulation cycle is shown in the table.

Parameter

AC0~AC1

Duty Cycle

Modulation Cycle I (i=0~1)

i<AC

(DC+1)/512

³AC

DC/512

A (8+2) bits mode PWM cycle is divided into four modulation cycles (modulation cycle 0~modulation cycle 3). Each

modulation cycle has 256 PWM input clock period. In a (8+2) bit PWM function, the contents of the PWM register is di-

vided into two groups. Group 1 of the PWM register is denoted by DC which is the value of PWMH.7~PWMH.0. The

group 2 is denoted by AC which is the value of PWML.1~PWML.0 (PWML). In a (8+2) bits mode PWM cycle, the duty

cycle of each modulation cycle is shown in the table.

Parameter

AC0~AC3

Duty Cycle

Modulation Cycle I (i=0~3)

i<AC

(DC+1)/256

³AC

DC/256

A (7+3) bits mode PWM cycle is divided into eight modulation cycles (modulation cycle 0~modulation cycle 7). Each

modulation cycle has 128 PWM input clock period. In a (7+3) bit PWM function, the contents of the PWM register is di-

vided into two groups. Group 1 of the PWM register is denoted by DC which is the value of PWMH.7~PWMH.1. The

group 2 is denoted by AC which are the value of PWMH.0 and PWML.1~PWML.0 (PWMH.0~PWML.0). In a (7+3) bits

mode PWM cycle, the duty cycle of each modulation cycle is shown in the table.

Parameter

AC0~AC7

Duty Cycle

Modulation Cycle I (i=0~7)

i<AC

(DC+1)/128

³AC

DC/128

The modulation frequency, cycle frequency and cycle duty of the PWM output signal are summarized in the following

table.

PWM Modulation Frequency

PWM Cycle Frequency

PWM Cycle Duty

fPWM/1024 for standard 10-bits mode

fPWM/512 for (9+1) bits mode

fPWM/256 for (8+2) bits mode

fPWM/128 for (7+3) bits mode

fPWM/1024

[PWM]/1024

f P W M / 2

P W M

[ P W M ] = 1 0 0

1 0 0 / 1 0 2 4

P W M M o d u l a t i o n P e r i o d : 1 0 2 4 / f P W M

P W M F u l l C y c l e : 1 0 2 4 / f P W M

Standard 10 Bit PWM Mode

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