Renesas SH7781 User Manual
Page 800
16. Watchdog Timer and Reset (WDT)
Rev.1.00 Jan. 10, 2008 Page 770 of 1658
REJ09B0261-0100
(2)
Manual Reset
• Requesting sources
⎯ A general exception other than a user break while the BL bit in SR is set to 1.
⎯ WDTCNT overflow when both the WT/IT and RSTS bits in WDTCSR are set to 1
• Branch address: H'A000 0000
• Operation until branching
The exception code H'020 is set in EXPEVT. After initializing VBR and SR, the processing
branches by setting PC = H'A000 0000.
During initialization, the VBR register is rest to H'0000 0000. The SR register is initialized
such that the MD, RB, and BL bits are set to 1, the FD bit is cleared to 0, and the interrupt
mask level bits (IMASK3 to IMASK0) are set to B'1111.
Then, the CPU and peripheral modules are initialized. For details, refer to the register
descriptions in the corresponding sections.
Manual_reset()
{
EXPEVT = H'0000 0020;
VBR = H'0000 0000;
SR.MD = 1;
SR.RB = 1;
SR.BL = 1;
SR.(I0-I3) = B'1111;
SR.FD = 0;
Initialize_CPU();
Initialize_Module(Manual);
PC = H'A000 0000;
}