SH7020 Datasheet, PDF (265/509 Pages) Renesas Technology Corp – SuperH™ RISC engine

CK
External clock
input pin
TCNT input
clock
TCNT
N–1
N
N+1
Figure 10.18 Count Timing for External Clock Sources
Compare-Match Waveform Output Function: For ITU channels 0, 1, 3, and 4, the output from
the corresponding TIOCA and TIOCB pins upon compare matches A and B can be in three
modes: 0-level output, 1-level output, or toggle. Toggle output cannot be selected in channel 2.
• Procedure for selecting the waveform output mode (figure 10.19):
1. Set the TIOR to select 0 output, 1 output, or toggle output for compare match output. The
compare match output pin will output 0 until the first compare match occurs.
2. Set a value in the GRA or GRB to select the compare match timing.
3. Set the STR bit in the TSTR to 1 to start counting.
Output selection
Select waveform
output mode
(1)
Select
output timing
(2)
Start counting
(3)
Waveform output
Figure 10.19 Procedure for Selecting the Compare Match Waveform Output Mode
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