SH7050 Datasheet, PDF (357/841 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH RISC engine Family/

Section 10 Advanced Timer Unit (ATU)
Starting a Count with a Down-Counter Value of H'0000: A one-shot pulse will not be output if
the down-count start register (DSTR) is set and the down-counter (DCNT) count started from the
CPU, or the timer connection register (TCNR) is set and DCNT is started by a channel 1 or
channel 2 compare-match, when the DCNT value is H'0000. However, the OSF bit in the timer
status register (TSR) will be set to 1.
The timing in this case is shown in figure 10.61
CK
DCNT input clock
DCNT
Internal write signal
DSTR
TSR
H'0000
1 written
to DST
bit in
DSTR
H'0000
Port output
(one-shot pulse)
Remains unchanged at 0
Figure 10.61 Starting a Count with a Down-Counter Value of H'0000
Rev. 5.00 Jan 06, 2006 page 337 of 818
REJ09B0273-0500