Section 16 Watchdog Timer and Reset
Rev.1.00 Dec. 13, 2005 Page 640 of 1286
REJ09B0158-0100
16.5.3
Manual Reset by Watchdog Timer Overflow
The transition time from watchdog timer overflowed to manual reset state (watchdog timer reset
setup time) is 1 clock cycle of the XTAL clock and thereafter equal to or more than 5 clock cycles
of the peripheral clock (Pck).
The manual reset time (watchdog timer manual reset holding time) by the watchdog timer
overflowed is equal to or more than 3774 clock cycles of the XTAL clock.
The STATUS [1:0] pins output timing that indicates the reset state or a normal operation is
asynchronous with both the XTAL clock and the CLKOUT pin output clock because the STATUS
[1:0] pins output timing is synchronous with the peripheral clock (Pck).
Manual Reset by Watchdog timer Overflowed in Normal Operation
CLKOUT
output
WDT overflow
signal
STATUS[1:0]
output
HH (reset)
LL (normal)
LL (normal)
XTAL
(oscillator)
WDT reset
setup time
Manual reset
holding time
MRESETOUT
output
Figure 16.8 STATUS Output by Watchdog timer overflow Manual Reset
during Normal Operation
Содержание SH7780 Series
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