SH7059 Datasheet, PDF (400/1042 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

11. Advanced Timer Unit-II (ATU-II)
Sample Setup Procedure for Offset One-Shot Pulse Output/Cutoff Operation: An example of the setup procedure for
offset one-shot pulse output is shown in figure 11.57.
Start
Select counter clock 1
Set port-ATU-II connection 2
Set pulse width
3
Set offset width
4
Set offset operation 5
Start count
6
Offset one-shot pulse output
1. Set the first-stage counter clock ' in prescaler register 1
(PSCR1), and select the second-stage counter clock " with
the CKSEL bit in the timer control register (TCR1, TCR2,
TCR8).
2. Set port K control registers H and L (PKCRH, PKCRL)
corresponding to the waveform output port to ATU one-shot
pulse output. Also set the corresponding bit to 1 in the port
K IO register (PKIOR) to specify the output attribute
3. Set the one-shot pulse width in the down-counter (DCNT)
corresponding to the port set in (2). If necessary, a timer
interrupt request can be sent to the CPU when the down-
counter underflows by making the appropriate setting in the
interrupt enable register (TIER8).
4. Set the offset width in the channel 1 or 2 general register
(GR1A—GR1H, GR2A—GR2H) connected to the down-
counter (DCNT) corresponding to the port set in (2), and in
the output compare register (OCR1, OCR2A—OCR2H). Set
the timer I/O control register (TIOR1A—TIOR1D,
TIOR2A—TIOR2D) to the compare-match enabled state.
5. Set the start/terminate trigger by means of the trigger mode
register (TRGMDR), timer connection register (TCNR), and
one-shot pulse terminate register (OTR), so that it
corresponds to the port set in (2).
6. Set the corresponding bit to 1 in the timer start register
(TSTR) to start the channel 1 or 2 free-running counter
(TCNT1, TCNT2). When the TCNT value and GR value or
OCR value match, the corresponding DCNT starts counting
down or is forcibly cleared, and one-shot pulse output is
performed.
Figure 11.57 Sample Setup Procedure for Offset One-Shot Pulse Output
Rev.3.00 Mar. 12, 2008 Page 310 of 948
REJ09B0177-0300