Section 11 14-Bit Pwm (H8/3857 Group Only); Overview; Features; Block Diagram - Renesas F-ZTAT H8 Series Hardware Manual

Section 11 14-Bit PWM (H8/3857 Group Only)

11.1

Overview

The H8/3857 Group is provided with a 14-bit PWM (pulse width modulator), which can be used
as a D/A converter by connecting a low-pass filter. The H8/3854 Group does not have this
module.
11.1.1

Features

Features of the 14-bit PWM are as follows.
• Choice of two conversion periods
A conversion period of 32,768/φ, with a minimum modulation width of 2/φ (PWCR0 = 1), or a
conversion period of 16,384/φ, with a minimum modulation width of 1/φ (PWCR0 = 0), can be
chosen.
• Pulse division method for less ripple
11.1.2

Block Diagram

Figure 11.1 shows a block diagram of the 14-bit PWM.
φ/2
φ/4
PWM
Legend:
PWDRL: PWM data register L
PWDRU: PWM data register U
PWCR: PWM control register
PWM
waveform
generator
Figure 11.1 Block Diagram of the 14 bit PWM
11. 14-Bit PWM (H8/3857 Group Only)
PWDRL
PWDRU
PWCR
Rev.3.00 Jul. 19, 2007 page 311 of 532
REJ09B0397-0300