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2. 14-Bit PWM
The H8/300L Series microcomputers provide a single channel pulse division type 14-bit PWM
(pulse width modulation) on-chip. It can be used as a 14-bit D/A converter when combined
with an external low pass filter.
Features:
• Either a conversion period of 32768/ø and a minimum conversion width of 2/ø,
or a conversion period of 16384/ø and a minimum conversion width of 1/ø.
• A pulse division circuit is employed to reduce ripple.
Block Diagram
ø/2
ø/4
PWM
<Notation>
PWDRL:
PWM data register L
PWDRU:
PWM data register H
PWCR:
PWM control register
PWM waveform
generator
93
Peripheral Functions
PWCR
PWDRL
PWDRU
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