SH79F3283PSLASH032PR datasheet(87/144 Pages) SINOWEALTH

87 / 144 page

SH79F3283

8.4 12-bit PWM1 (Pulse Width Modulation)

8.4.1 Feature

 8 bit resolution ratio, provide prescaler function

 Provided overflow and duty interrupt function on every PWM period

 Selectable output polarity, can be use as normal timer when the enable bit is set to 0

The SH79F3283 has one 8-bit PWM module, which can provide the pulse width modulation waveform with the period and the

duty being controlled individually by corresponding register. The PWM module clock source or pin output selection is

controlled by PWM1C register. The PWM module Period selection is controlled by PWM1P register. The PWM module Duty

selection is controlled by PWM1D register.

8.4.2 Register

Table 8.21 PWM1 Control Register

D9H, Bank0

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

PWM1C

PWM1EN

PWM1S

TnCK11

TnCK10

PWM1IE

PWM1IF

PWM1OE

R/W

Reset Value

(POR/WDT/LVR/PIN)

Bit Number

Bit Mnemonic

Description

PWM1EN

PWM1 module enable control bit

0: disable PWM1 module

1: enable PWM1 module

PWM1S

PWM1 output normal mode of duty cycle

0: high active, PWM1 output high during duty time, output low during remain

period time

1: low active, PWM1 output low during duty time, output high during remain

period time

5-4

TnCK1[1:0]

PWM1 clock select bit

00: system clock/1

01: system clock/8

10: system clock/64

11: system clock/256

PWM1IE

PWM1 interrupt enable bit (When EPWM bit in IEN1 is set)

0: Disable PWM1interrupt

1: Enable PWM1 interrupt

PWM1IF

PWM1 interrupt flag bit

0: Clear by software

1: Set by hardware to indicate that the PWM1 period counter overflow

PWM1OE

PWM1 output control bit

0: PWM1 is disable, shared as I/O

Note: This bit is set to 0, but PWM1EN = 1, so that PWM1 module is still

working, just no waveform output. PWM1 can be use as normal timer

1: PWM1 is enable

Note: If this bit is set to 1 and PWM1EN = 0, so that PWM1 output inactive

level (Select high level output low level, select low level output high

level)

SH79F3283P/032PR Datasheet(PDF) 87 Page - SINOWEALTH Electronic Ltd

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