Rainbow Electronics ATmega64M1 - Manual (Page 313)

313
8209A–AVR–08/09
ATmega16M1/32M1/64M1
29.6 System and Reset Characteristics
Notes: 1. Values are guidelines only
2. Before rising, the supply has to be between V
PORMIN
and V
PORMAX
to ensure a Reset.
Notes: 1. V
BOT
may be below nominal minimum operating voltage for some devices. For devices where
this is the case, the device is tested down to V
CC
= V
BOT
during the production test. This guar-
antees that a Brown-Out Reset will occur before V
CC
drops to a voltage where correct
operation of the microcontroller is no longer guaranteed. The test is performed using
BODLEVEL = 010 for Low Operating Voltage and BODLEVEL = 101 for High Operating Volt-
age .
2. Values are guidelines only.
Table 29-2. Reset, Brown-out (1) and Internal Voltage (1) Characteristics
Symbol Parameter Min Typ Max Units
V
POT
Power-on Reset Threshold Voltage (rising) 1.1 1.4 1.7 V
Power-on Reset Threshold Voltage (falling) (2) 0.8 0.9 1.6 V
V
PORMAX
VCC Max. start voltage to ensure internal
Power-on Reset signal
0.4 V
V
PORMIN
VCC Min. start voltage to ensure internal
Power-on Reset signal
-0.1 V
V
CCRR
VCC Rise Rate to ensure Power-on Reset 0.01 V/ms
V
RST
RESET Pin Threshold Voltage 0.1 V
CC
0.9V
CC
V
V
HYST
Brown-out Detector Hysteresis 50 mV
t
BOD
Min Pulse Width on Brown-out Reset 2 µs
V
BG
Bandgap reference voltage 1.1 V
t
BG
Bandgap reference start-up time 40 µs
I
BG
Bandgap reference current consumption 15 µA
Table 29-3. BODLEVEL Fuse Coding (1)(2)
BODLEVEL 2..0 Fuses Min V
BOT
Typ V
BOT
Max V
BOT
Units
111 2.6
110
RESERVED 101
100
011 4.3 V
010 2.7 V
001 4.5 V
000 DISABLED