SH7058 Datasheet, PDF (443/1130 Pages) Renesas Technology Corp – Renesas SuperHTM RISC engine

Sample Setup Procedure for Waveform Output by Output Compare-Match: An example of
the setup procedure for waveform output by output compare-match is shown in figure 11.54.
Start
Select counter clock 1
Set port-ATU-II connection 2
Select waveform output
mode
3
Set output timing
4
Start counter
5
1. Select the first-stage counter clock ' in prescaler register
(PSCR), and the second-stage counter clock " with the
CKSEL bit in the timer control register (TCR). When
selecting an external clock, also select the external clock
edge type with the CKEG bit in TCR.
2. Set the port control register corresponding to the waveform
output port to ATU output compare-match output. Also set
the corresponding bit to 1 in the port IO register to specify
the output attribute for the port.
3. Select 0, 1, or toggle output for output compare-match
output with the timer I/O control register (TIOR). If
necessary, a timer interrupt request can be sent to the CPU
on output compare-match by making the appropriate setting
in the interrupt enable register (TIER).
4. Set the timing for compare-match generation in the ATU
general register (GR) corresponding to the port set in (2).
5. Set the corresponding bit to 1 in the timer start register
(TSTR) to start the free-running counter (TCNT). Waveform
output is performed from the relevant port when the TCNT
value and GR value match.
Waveform output
Figure 11.54 Sample Setup Procedure for Waveform Output by Output Compare-Match
Rev. 3.0, 09/04, page 402 of 1086