HT45F23 datasheet(72/152 Pages) HOLTEK

72 / 152 page

The following diagram illustrates the waveforms associated with the 6+2 mode of PWM operation. It

is important to note how the single PWM cycle is subdivided into 4 individual modulation cycles,

numbered from 0~3 and how the AC value is related to the PWM value.

7+1 PWM Mode

Each full PWM cycle, as it is controlled by an 8-bit PWM register, has 256 clock periods. However, in

the 7+1 PWM mode, each PWM cycle is subdivided into two individual sub-cycles known as

modulation cycle 0 ~ modulation cycle 1, denoted as i in the table. Each one of these two sub-cycles

contains 128 clock cycles. In this mode, a modulation frequency increase of two is achieved. The 8-bit

PWM register value, which represents the overall duty cycle of the PWM waveform, is divided into two

groups. The first group which consists of bit1~bit7 is denoted here as the DC value. The second group

which consists of bit0 is known as the AC value. In the 7+1 PWM mode, the duty cycle value of each of

the two modulation sub-cycles is shown in the following table.

Parameter

AC (0~1)

DC (Duty Cycle)

Modulation cycle i

(i=0~1)

i<AC

DC+1

128

³AC

128

7+1 Mode Modulation Cycle Values

Rev. 1.20

September 15, 2011

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

P W M R e g i s t e r

( 6 + 2 ) M o d e

b 7

b 0

A C v a l u e

D C v a l u e

PWM Register for 6+2 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

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

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