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8XC196MC, MD, MH USER'S MANUAL
9.4
PROGRAMMING THE WAVEFORM GENERATOR
This section explains how to configure the waveform generator and determine its status.
9.4.1
Configuring the Outputs
The waveform generator's outputs are multiplexed with general-purpose output port 6, so you
must configure them as special-function signals to use them as waveform-generator outputs. The
WG_OUTPUT register (Figure 9-8) configures the pins, establishes the output polarity, and con-
trols whether changes to the outputs are synchronized with an event or take effect immediately.
Four bits of WG_OUTPUT are unrelated to the waveform generator; they configure the outputs
for the pulse-width modulator (PWM) peripheral, which also shares pins with port 6. The P6 and
PE6 bits control the P6.6/PWM0 pin, and the P7 and PE7 bits control the P6.7/PWM1 pin. Their
placement in this register allows you to configure all the port 6 pins with a single write to
WG_OUTPUT.
Table 9-5 shows the bit combinations necessary to drive the waveform generator's outputs high
or low or to connect them to the WG_EVEN or WG_ODD signal. Note that PHx.2 is always set
to select the waveform-generator signal function (clearing PHx.2 selects the general-purpose I/O
port function). The "Output Polarities" column shows the output polarities. The drawings show
a duty cycle of about 15%, and for these cases, the high portion of the waveforms increases as
dead time increases.
,
PH x .2
PH x .1
PH x .0
1
0
0
1
0
1
1
1
0
1
1
1
NOTE: This table assumes active-high outputs (OP1=OP0=1).
9-12
Table 9-5. Output Configuration
Output Values
WG x
WG x #
Low
Low
Low
WG_EVEN#
WG_ODD
Low
WG_ODD
WG_EVEN
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Output Polarities
WG x
Always Low
Always Low
WG x #
Always Low
Always Low
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