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CHAPTER 13 16-BIT PPG TIMER
13.1
Overview of 16-bit PPG Timer
The 16-bit PPG timer consists of a 16-bit down counter, prescaler, 16-bit period setting
register, 16-bit duty setting register, 16-bit control register and a PPG output pin.
■ 16-bit PPG Timer (× 3, PPG1 is not present in MB90465 Series)
The 16-bit PPG timer consists of a 16-bit down counter, prescaler, 16-bit period setting register, 16-bit duty
setting register, 16-bit control register and a PPG output pin. This module can be used to output pulses
synchronized by software trigger or GATE signal from Multi-functional timer, refer to "Multi-functional
Timer" in chapter 14.
• 8 types of counter operation clock (φ, φ/2, φ/4, φ/8, φ/16, φ/32, φ/64, φ/128) can be selected
(φ is the machine clock).
• An interrupt is generated when there is a trigger or an counter borrow or when PPG rising (normal
polarity) / PPG falling (inverted polarity).
• PPG output operation
The 16-bit PPG timer can output pulse waveforms with variable period and duty ratio. Also, it can be
used as D/A converter in conjunction with an external circuit.
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