HD643303x Hitachi, HD643303x Datasheet - Page 230

• Manufacturer Part Number: HD643303x
• Description: Hitachi Microcomputer
• Manufacturer: Hitachi

Waveform Output by Compare Match: In ITU channels 0, 1, 3, and 4, compare match A or B
can cause the output at the TIOCA or TIOCB pin to go to 0, go to 1, or toggle. In channel 2 the
output can only go to 0 or go to 1.
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Sample setup procedure for waveform output by compare match
Figure 8-19 shows a sample procedure for setting up waveform output by compare match.
Examples of waveform output
Figure 8-20 shows examples of 0 and 1 output. TCNT operates as a free-running counter, 0
output is selected for compare match A, and 1 output is selected for compare match B. When
the pin is already at the selected output level, the pin level does not change.
Figure 8-19 Setup Procedure for Waveform Output by Compare Match (Example)
Waveform output
Set output timing
Select waveform
Output setup
Start counter
output mode
1
2
3
1.
2.
3.
Select the compare match output mode (0, 1, or
toggle) in TIOR. When a waveform output mode
is selected, the pin switches from its generic input/
output function to the output compare function
(TIOCA or TIOCB). An output compare pin outputs
0 until the first compare match occurs.
Set a value in GRA or GRB to designate the
compare match timing.
Set the STR bit to 1 in TSTR to start the timer
counter.
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