XC886/888CLM
Power Supply, Reset and Clock Management
User’s Manual
7-4
V1.3, 2010-02
Power, Reset and Clock, V 1.0
Figure 7-2
Reset Circuitry
Figure 7-3
V
DDP,
V
DDC
and
V
RESET
during Power-on Reset
When the system starts up, the PLL is disconnected from the oscillator and will run at its
base frequency. Once the EVR is stable, provided the oscillator is running, the PLL is
connected and the continuous lock detection ensures that PLL starts functioning.
Following this, as soon as the system clock is stable, each 4-Kbyte Flash bank will enter
the ready-to-read mode.
V
SSP
V
DDP
V
DDC
V
SSC
3.3 / 5V
RESET
EVR
VR
V
IN
100nF
220nF
typ.
100nF
XC886/888
30k
V
DDP
RESET with
capacitor
2.3V
V
DDC
< 0.4V
0.9*
V
DDC
0V
5V
5V
2.5V
Voltage
Voltage
Time
Time
typ. < 50
µ
s
*