Pwm Operation; Figure 12.9 Pwm Mode Example (1) - Renesas H8 Series Hardware Manual

12.4.2

PWM Operation

In PWM mode, PWM waveforms are generated by using GRA as the period register and GRB,
GRC, and GRD as duty registers. PWM waveforms are output from the FTIOB, FTIOC, and
FTIOD pins. Up to three-phase PWM waveforms can be output. In PWM mode, a general register
functions as an output compare register automatically. The output level of each pin depends on the
corresponding timer output level set bit (TOB, TOC, and TOD) in TCRW. When TOB is 1, the
FTIOB output goes to 1 at compare match A and to 0 at compare match B. When TOB is 0, the
FTIOB output goes to 0 at compare match A and to 1 at compare match B. Thus the compare
match output level settings in TIOR0 and TIOR1 are ignored for the output pin set to PWM mode.
If the same value is set in the cycle register and the duty register, the output does not change when
a compare match occurs.
Figure 12.9 shows an example of operation in PWM mode. The output signals go to 1 and TCNT
is cleared at compare match A, and the output signals go to 0 at compare match B, C, and D
(TOB, TOC, and TOD = 1: initial output values are set to 1).
TCNT value
GRA
GRB
GRC
GRD
H'0000
FTIOB
FTIOC
FTIOD
Counter cleared by compare match A

Figure 12.9 PWM Mode Example (1)

Section 12 Timer W
Time
Rev. 1.00 Aug. 28, 2006 Page 181 of 400
REJ09B0268-0100