HT46R063B datasheet(49/96 Pages) HOLTEK

49 / 96 page

HT46R064B/065B/066B

Rev. 1.00

April 8, 2011

7+1 PWM Mode

Each full PWM cycle, as it is controlled by an 8-bit PWM

PWM mode, each PWM cycle is subdivided into two indi-

vidual sub-cycles known as modulation cycle 0 ~ modula-

tion 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 de-

noted 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 mod-

ulation sub-cycles is shown in the following table.

Parameter

AC (0~1)

(Duty Cycle)

Modulation cycle i

(i=0~1)

i<AC

DC+1

128

³AC

128

7+1 Mode Modulation Cycle Values

The following diagram illustrates the waveforms associ-

ated with the 7+1 mode PWM operation. It is important

to note how the single PWM cycle is subdivided into 2 in-

dividual modulation cycles, numbered 0 and 1 and how

the AC value is related to the PWM value.

PWM Output Control

The PWM outputs are pin-shared with the I/O pins PA4,

PC2 and PC3. To operate as a PWM output and not as

an I/O pin, the correct bits must be set in the CTRL0 and

CTRL2 register. A zero value must also be written to the

corresponding bit in the I/O port control register PAC.4,

PCC.2 and PCC.3 to ensure that the corresponding

PWM output pin is setup as an output. After these two

initial steps have been carried out, and of course after

the required PWM value has been written into the

PWMn register, writing a high value to the correspond-

ing bit in the output data register PA.4, PC.2 and PC.3

will enable the PWM data to appear on the pin. Writing a

zero value will disable the PWM output function and

force the output low. In this way, the Port data output

registers can be used as an on/off control for the PWM

function. Note that if the CTRL0 and CTRL2 registers

have selected the PWM function, but a high value has

been written to its corresponding bit in the PAC or PCC

control register to configure the pin as an input, then the

pin can still function as a normal input line, with pull-high

resistor options.

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

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

HT46R063B Datasheet(PDF) 49 Page - Holtek Semiconductor Inc

HT46R063B Datasheet(HTML) 49 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96

Datasheet Download

Link URL