XC886/888CLM
Power Supply, Reset and Clock Management
User’s Manual
7-5
V1.3, 2010-02
Power, Reset and Clock, V 1.0
The status of pins MBC, TMS and P0.0 is latched by the reset. The latched values are
used to select the boot options (see
). A correctly executed reset leaves
the system in a defined state. The program execution starts from location 0000
H
.
shows the power-on reset sequence.
Figure 7-4
Power-on Reset
Note: When V
DDP
is not powered on, the current over any GPIO pin must not source
V
DDP
higher than 0.3 - 0.5 V.
7.2.1.2
Hardware Reset
An external hardware reset sequence is started when the reset input pin RESET is
asserted low. To ensure the recognition of the hardware reset, pin RESET must be held
low for at least 100 ns. After the RESET pin is deasserted, the reset sequence is the
same as the power-on reset sequence, as shown in
. A hardware reset
through RESET pin will terminate the idle mode or the power-down mode.
The status of pins MBC, TMS and P0.0 is latched by the reset. The latched value is used
to select the boot options (see
7.2.1.3
Watchdog Timer Reset
The watchdog timer reset is an internal reset. The Watchdog Timer (WDT) maintains a
counter that must be refreshed or cleared periodically. If the WDT is not serviced
correctly and in time, it will generate an NMI request to the CPU and then reset the
device after a predefined time-out period. Bit PMCON0.WDTRST is used to indicate the
watchdog timer reset status.
For watchdog timer reset, as the EVR is already stable and PLL lock detection is not
needed, the timing for watchdog timer reset is approximately 200
µ
s, which is shorter
compared to the other types of resets.
EVR is stable
Typ. 300 µs
PLL is locked
Max. 200 µs
Typ. 160 µs
FLASH go to
Ready-to-Read
Mode
Reset is
released and
start of program
*
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