r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 765

• Manufacturer Part Number: r5s77631ay266bgv
• Description: Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series
• Manufacturer: Renesas Electronics Corporation.

19.4
Each channel has a 32-bit timer counter (TCNT) and a 32-bit timer constant register (TCOR).
Each TCNT performs count-down operation. The channels have an auto-reload function that
allows cyclic count operations, and can also perform external event counting. Channel 2 also has
an input capture function.
19.4.1
When one of bits STR0 to STR2 in TSTR is set to 1, the TCNT for the corresponding channel
starts counting. When TCNT underflows, the UNF flag in TCR is set. If the UNIE bit in TCR is
set to 1 at this time, an interrupt request is sent to the CPU. At the same time, the value is copied
from TCOR into TCNT, and the count-down continues (auto-reload function).
(1)
Figure 19.2 shows an example of the count operation setting procedure.
Example of Count Operation Setting Procedure
Operation
Counter Operation
Rev. 1.00 Oct. 01, 2007 Page 699 of 1956
Section 19 Timer Unit (TMU)
REJ09B0256-0100