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Chapter 39 Programmable Pulse Generator
1.Overview
Chapter 39 Programmable Pulse Generator
1. Overview
Programmable Pulse Generators (PPGs) are used to gain one-shot (rectangular wave) output or pulse width
modulation (PWM) output. With their software-programmable cycle and duty capability, the PPGs comfortably
fit into broad applications.
2. Features
• Output waveforms: The PPGs can generate the following six kinds of waveforms:
• One-shot waveform (Rectangular wave)
• Clamped output
Normal polarity: “L” Clamped output
Inverted polarity: “H” Clamped output
• Quantity: 4 groups (Output: 16 channels PPG0 - PPG15)
• Count clock: Choose from four choices.
1, 1/4, 1/16, 1/64 of the peripheral clock (CLKP)
• Period: Setting range = Duty value ~ 65535 (specified with a 16-bit register)
Period = Count clock (PCSR register value + 1)
(Example) Count clock = 32MHz(31.25ns), PCSR value = 63999
Period = 31.25ns (63999+1) = 2ms
• Duty: Setting range = 0 ~ Period value (specified with a 16-bit register)
Duty = Count clock (PDUT register value + 1)
Down counter
Buffer
Duty value
Latch
Count clock
Reload
Borrow
InvertMatch
Output
value
Pin
Period value
L H L L H
H L H H L
L H L L H
H L H H L
• PWM waveform
Normal polarity:
Inverted polarity:
L H L
H L H
L H L
H L H
Normal polarity:
Inverted polarity: