HT45F23 datasheet(71/152 Pages) HOLTEK

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BPCTL Register

Bit

76543210

Name

PMODE

PWM1EN

PWM0EN

BC1

BC0

BZ2

BZ1

BZ0

R/W

POR

00000000

Bit 7

PMODE: PWM type selection

0: 7+1

1: 6+2

Bit 6

PWM1EN: PWM1 or the other pin-shared functions

0: the other pin-shared functions

1: PWM1

Bit 5

PWM0EN: PWM0 or the other pin-shared functions

0: the other pin-shared functions

1: PWM0

Bit 4~0

Buzzer output and I/O configuration selection, described elsewhere

6+2 PWM Mode

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

the 6+2 PWM mode, each PWM cycle is subdivided into four individual sub-cycles known as

modulation cycle 0 ~ modulation cycle 3, denoted as i in the table. Each one of these four sub-cycles

contains 64 clock cycles. In this mode, a modulation frequency increase of four 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 bit2~bit7 is denoted here as the DC value. The second

group which consists of bit0~bit1 is known as the AC value. In the 6+2 PWM mode, the duty cycle

value of each of the four modulation sub-cycles is shown in the following table.

Parameter

AC (0~3)

DC (Duty Cycle)

Modulation cycle i

(i=0~3)

i<AC

DC+1

³AC

6+2 Mode Modulation Cycle Values

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

Rev. 1.20

September 15, 2011

HT45F23 데이터시트(PDF) 71 Page - Holtek Semiconductor Inc

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