5-5
MB86R02 ‘Jade-D’ Hardware Manual V1.64
5.
Watchdog reset
The watchdog timer starts when the WDTSET/WDTCLR bits of the watchdog timer control
register (CRWR) are set to "1" after an external reset. Writing "1" to the WDTSET/WDTCLR
bits a second time or at a later point in time clears the timer.
The clock source of the watchdog timer is the count value of the time based timer.
A clear operation of the time based timer effects the watchdog timer’s count value.
When the timer is cleared, the watchdog timer is also cleared.
Selected time base timer bit
WDTCLR (max)
WDTCLR (min)
Watchdog reset request
Tclk x 2
n
Tclk x 2
(n+1)
Figure 5-2 Watchdog reset timing
As shown in Figure 5-2, a watchdog reset occurs after the second falling edge of the
selected time-based timer bit.
In ARM9 debug mode (DBGACK = 1)during PLL oscillation stabilization waiting time, CRG
clears the watchdog timer. In addition, it monitors the standby mode of the ARM9 core and
clears the watchdog timer automatically in standby mode (standby mode = 1.)
Reset output signal
The reset signal output by the reset generator is as follows depending on the reset source:
HRESETn (AHB/APB bus reset)
This internal reset signal initializes the ARM9 core and AHB/APB peripherals and is
output by an external reset, software reset or XSRST
reset.
XSRST (reset monitoring)
This signal functions as a report to the external circuit of ARM’s internal reset
source. This signal is asserted in the same way as the HRESETn signal.
Internal XTRST (built-in ICE macro reset)
This signal initializes the embedded macro of the ARM9 core. The macro must be
reset at power-on so that this signal is output by an external reset or an external
XTRST reset.
CRSTn (internal reset)
This signal is output by an external reset or an XSRST reset.
Summary of Contents for MB86R02
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