Section 16 Watchdog Timer and Reset
Rev.1.00 Dec. 13, 2005 Page 638 of 1286
REJ09B0158-0100
PRESET
input during Sleep Mode
It is necessary to ensure the PLL oscillation time when power-on reset generates by the
PRESET
pin low revel input during sleep mode.
CLKOUT
output
STATUS[1:0]
output
HH (reset)
LL (normal)
HL (sleep)
PLL synchronization
settling time
Reset holding
time
XTAL
(oscillator)
PRESET
input
Figure 16.5 STATUS Output by Reset input during Sleep Mode
16.5.2 Power-On
Reset
by Watchdog Timer Overflow
The transition time from the watchdog timer overflowed to the power-on 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 power-on reset time (watchdog timer reset holding time) by the watchdog timer overflowed is
3774 clock cycles of the XTAL clock and thereafter equal to or more than 45 clock cycles of the
peripheral clock (Pck).
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).
Содержание SH7780 Series
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