XC886/888CLM
Power Supply, Reset and Clock Management
User’s Manual
7-6
V1.3, 2010-02
Power, Reset and Clock, V 1.0
7.2.1.4
Power-Down Wake-Up Reset
Power is still applied to the XC886/888 during power-down mode, as the low power
voltage regulator is still operating. If power-down mode is entered appropriately, all
important system states will have been preserved in the Flash by software.
If the XC886/888 is in power-down mode, three options are available to awaken it:
•
through RXD
•
through EXINT0
•
through RXD or EXINT0
Selection of these options is made via the control bit PMCON0.WS. The wake-up from
power-down can be with reset or without reset; this is chosen by the PMCON0.WKSEL
bit. The wake-up status (with or without reset) is indicated by the PMCON0.WKRS bit.
shows the power-down wake-up reset sequence. The EVR takes
approximately 150
µ
s to become stable, which is a shorter time period compared to the
power-on reset.
Figure 7-5
Power-down Wake-up Reset
In addition to the above-mentioned three options, the power-down mode can also be
exited by the hardware reset through RESET pin.
7.2.1.5
Brownout Reset
In active mode, the
V
DDC
detector in EVR detects brownout when the core supply voltage
V
DDC
dips below the threshold voltage
V
DDC_TH
(2.1 V). The brownout will cause the
device to be reset. In power-down mode, the
V
DDC
is monitored by the POR in EVR and
a reset is generated when
V
DDC
drops below 1.5 V.
Once the brownout reset takes place, the reset sequence is the same as the power-on
reset sequence, as shown in
EVR is stable
Typ. 150 µs
PLL is locked
Max. 200 µs
Typ. 160 µs
FLASH go to
Ready-to-Read
Mode
Reset is
released and
start of program
*
Содержание XC886CLM
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