Section 11 14-Bit PWM
11.1
Overview
The H8/3887 Series is provided with a 14-bit PWM (pulse width modulator) on-chip, which can
be used as a D/A converter by connecting a low-pass filter.
11.1.1
Features of the 14-bit PWM are as follows.
Choice of two conversion periods
Features
•
Any of the following four conversion periods can be chosen:
131,072/ø, with a minimum modulation width of 8/ø (PWCR1 = 1, PWCR0 = 1)
65,536/ø, with a minimum modulation width of 4/ø (PWCR1 = 1, PWCR0 = 0)
32,768/ø, with a minimum modulation width of 2/ø (PWCR1 = 0, PWCR0 = 1)
16,384/ø, with a minimum modulation width of 1/ø (PWCR1 = 0, PWCR0 = 0)
•
•
Pulse division method for less ripple
Use of module standby mode enables this module to be placed in standby mode independently
when not used.
11.1.2
Block Diagram
Figure 11-1 shows a block diagram of the 14-bit PWM.
324
ETC [ ETC ]
