Section 9
14-Bit PWM Timer (PWMX)
Rev. 1.00 Apr. 28, 2008 Page 233 of 994
REJ09B0452-0100
t
f1
t
f2
t
f255
t
f256
t
H1
t
H2
t
H3
t
H255
t
H256
1 conversion cycle
t
f1
= t
f2
= t
f3
= ··· = t
f255
= t
f256
= T
×
64
t
H1
+ t
H2
+ t
H3
+ ··· + t
H255
+ t
H256
= T
H
t
f1
t
f2
t
f63
t
f64
t
H1
t
H2
t
H3
t
H63
t
H64
1 conversion cycle
t
f1
= t
f2
= t
f3
= ··· = t
f63
= t
f64
= T
×
256
t
H1
+ t
H2
+ t
H3
+ ··· + t
H63
+ t
H64
= T
H
(a) CFS = 0 [base cycle = resolution (T)
×
64]
(b) CFS = 1 [base cycle = resolution (T)
×
256]
Figure 9.5 Output Waveform (OS = 1, DADR corresponds to T
H
)
An example of the additional pulses when CFS = 1 (base cycle = resolution (T)
×
256) and OS = 1
(inverted PWM output) is described below. When CFS = 1, the upper eight bits (DA13 to DA6) in
DADR determine the duty cycle of the base pulse while the subsequent six bits (DA5 to DA0)
determine the locations of the additional pulses as shown in figure 9.6.
Table 9.6 lists the locations of the additional pulses.
DA13 DA12 DA11 DA10 DA9
DA8
DA7
DA6
DA5
DA4
DA3
DA2
DA1
DA0
CFS
1
1
Duty cycle of base pulse
Location of additional pulses
Figure 9.6 D/A Data Register Configuration when CFS = 1
Содержание H8S/2100 Series
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