Section 16 Watchdog Timer and Reset
Rev.1.00 Dec. 13, 2005 Page 633 of 1286
REJ09B0158-0100
16.4 Operation
16.4.1 Reset
request
Power-on reset and manual reset are available. These sources are follows.
(1) Power-on
reset
•
Input low level via
PRESET
pin.
•
The WDTCNT overflows when the WT/IT bit in the WTCSR is 1, and the RSTS bit is 0.
•
The H-UDI reset occurs (for details, see section 30, User Debugging Interface (H-UDI)).
Power_on_reset()
{
EXPEVT = H'0000 0000;
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(PowerOn);
PC = H'A000 0000;
}
(2) Manual
reset
•
When a general exception other than a user break occurs while the BL bit is set to 1 in SR
•
When the WDTCNT overflows while the WT/IT bit and the RSTS bit are set to 1 in WTCSR.
Содержание SH7780 Series
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