Data Sheet

149
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
z Sampled mode for low power applications (programmable refresh frequency)
z Hysteresis
z Internal Voltage Regulator system (VREG)
z Operating modes:
z Normal mode
z Low-power mode
z With an internal non-configurable Brown-out detector (BOD12)
z Voltage Reference System (VREF)
z Bandgap voltage generator with programmable calibration value
z Temperature sensor
z Bandgap calibration value loaded from Flash Factory Calibration at startup
16.3 Block Diagram
Figure 16-1. SYSCTRL Block Diagram
XOSC
XOSC
32K
OSC3
2K
OSCU
LP
3
2
K
O
SC8
M
D
FLL48M
VO
LTA
GE
R
EFEREN
CE
S
Y
S
TEM
OSC
ILLAT
O
R
S
CO
NTR
O
L
P
O
WE
R
MO
NIT
O
R
CO
NTR
OL
V
O
LTA
G
E
REFEREN
C
E
CO
NTR
O
L
S
TATU
S
(
PCLKSR re
g
ister
)
I
NTERRUPT
S
G
ENERAT
OR
B
O
D3
3
I
nterru
p
t
s
S
Y
SC
TR
L
F
DPLL
96M