SH7280 Datasheet, PDF (133/1726 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine family

Section 5 Exception Handling
(3) Power-On Reset Initiated by WDT
When a setting is made for a power-on reset to be generated in the WDT’s watchdog timer mode,
and WTCNT of the WDT overflows, this LSI enters the power-on reset state.
In this case, WRCSR of the WDT and FRQCR of the CPG are not initialized by the reset signal
generated by the WDT.
If a reset caused by the RES pin or the H-UDI reset assert command occurs simultaneously with a
reset caused by WDT overflow, the reset caused by the RES pin or the H-UDI reset assert
command has priority, and the WOVF bit in WRCSR is cleared to 0. When power-on reset
exception processing is started by the WDT, the CPU operates in the same way as when a power-
on reset was caused by the RES pin.
Rev. 1.00 Jun. 26, 2008 Page 103 of 1692
REJ09B0393-0100