Datasheet

31. Typical Characteristics
Some of the Status Flags are cleared by writing a logical one to them. Note that the CBI and SBI
instructions will operate on all bits in the I/O Register, writing a one back into any flag read as set, thus
clearing the flag. The CBI and SBI instructions work with registers $00 to $1F only.
The power consumption in Power-down mode is independent of clock selection.
The current consumption is a function of several factors such as: operating voltage, operating frequency,
loading of I/O pins, switching rate of I/O pins, code executed and ambient temperature. The dominating
factors are operating voltage and frequency.
The current drawn from capacitive loaded pins may be estimated (for one pin) as C
L
*V
CC
*f where C
L
=
load capacitance, V
CC
= operating voltage and f = average switching frequency of I/O pin.
The parts are characterized at frequencies higher than test limits. Parts are not guaranteed to function
properly at frequencies higher than the ordering code indicates.
The difference between current consumption in Power-down mode with Watchdog Timer enabled and
Power-down mode with Watchdog Timer disabled represents the differential current drawn by the
Watchdog Timer.
31.1. Active Supply Current
Figure 31-1. Active Supply Current vs. Low Frequency (0.1 - 1.0 MHz)
ACTIVE S UP P LY CURRENT vs. LOW FREQUENCY
0.1 - 1.0 MHz
5.5 V
5.0 V
4.5 V
4.0 V
3.6 V
3.3 V
2.7 V
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Fre quency (MHz)
I
CC
(mA)
Atmel ATmega32A [DATASHEET]
Atmel-8155I-ATmega32A_Datasheet_Complete-08/2016
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