Overview - Fujitsu 8FX Hardware Manual

CHAPTER 19 16-BIT PPG TIMER

19.1 Overview

19.1 Overview
The 16-bit PPG timer can generate a PWM (Pulse Width Modulation) output or
one-shot (square wave) output, and the period and duty of the output waveform
can be changed by software freely. The timer can also generate an interrupt
when a start trigger occurs or on the rising or falling edge of the output
waveform.
■ 16-bit PPG Timer
The 16-bit PPG timer can output the PWM output and the one shot. The output wave form can
be reversed by setting the register (Normal polarity
Output waveform
PWM waveform
Normal polarity
Inverted polarity
One-shot waveform
Normal polarity
Inverted polarity
• The count operation clock can be selected from 12 different clock sources (MCLK,
MCLK/2, MCLK/4, MCLK/8, MCLK/16, MCLK/32, F
F
MCRPLL
clock, F
• Interrupt can be selectively triggered by the following four conditions:
- Occurrence of a start trigger in the PPG timer
- Occurrence of a counter borrow in the 16-bit downcounter (cycle match).
- Rising edge of PPG in normal polarity or falling edge of PPG in inverted polarity
- Counter borrow, rising edge of PPG in normal polarity, or falling edge of PPG in
inverted polarity
334
L H L
H L H
L H
H L
6 7
/2 or F /2 ). (MCLK: machine clock, F
MCRPLL
: main CR PLL clock)
MCRPLL
FUJITSU SEMICONDUCTOR LIMITED
MB95630H Series
Inverted polarity).
L H
H L
L
H
7
/2 , F /2
CH CH
: main clock, F
CH
MN702-00009-2v0-E
8 6 7
, F /2 , F /2 ,
CRH CRH
: main CR
CRH