HD64F3670 RENESAS [Renesas Technology Corp], HD64F3670 Datasheet - Page 164

• Manufacturer Part Number: HD64F3670
• Description: Hitachi Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

11.4.2
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 11.9 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).
Figure 11.10 shows another example of operation in PWM mode. The output signals go to 0 and
TCNT is cleared at compare match A, and the output signals go to 1 at compare match B, C, and
D (TOB, TOC, and TOD = 0: initial output values are set to 1).
Rev. 2.0, 03/02, page 140 of 298
PWM Operation
GRA
GRB
GRC
GRD
H'0000
FTIOB
FTIOC
FTIOD
TCNT value
Figure 11.9 PWM Mode Example (1)
Counter cleared by compare match A
Time