
199
4378C–AVR–09/08
AT90PWM1
19.8.4.2
ADLAR = 1
19.8.5
Digital Input Disable Register 0 – DIDR0
Bit 7:0 – ADC7D..ADC0D: ACMP2:1 and ADC7:0 Digital Input Disable
When this bit is written logic one, the digital input buffer on the corresponding ADC pin is dis-
abled. The corresponding PIN Register bit will always read as zero when this bit is set. When an
analog signal is applied to the ADC7..0 pin and the digital input from this pin is not needed, this
bit should be written logic one to reduce power consumption in the digital input buffer.
19.8.6
Digital Input Disable Register 1– DIDR1
Bit 5:0 – ACMP0D, AMP0+D, AMP0-D, ADC10D..ADC8D: ACMP0, AMP1:0 and ADC10:8
Digital Input Disable
When this bit is written logic one, the digital input buffer on the corresponding ADC pin is dis-
abled. The corresponding PIN Register bit will always read as zero when this bit is set. When an
analog signal is applied to an analog pin and the digital input from this pin is not needed, this bit
should be written logic one to reduce power consumption in the digital input buffer.
19.9
Amplifier
The AT90PWM1 features one differential amplified channel with programmable 5, 10, 20, and
40 gain stage.
On AT90PWM1, the amplifier has been improved in order to speed-up the conversion time.The
proposed improvement takes advantage of the amplifier characteristics to ensure a conversion
in less time.
In order to have a better understanding of the functioning of the amplifier synchronization, a tim-
As soon as a conversion is requested thanks to the ADSC bit, the Analog to Digital Conversion
is started. In case the amplifier output is modified during the sample phase of the ADC, the on-
going conversion is aborted and restarted as soon as the output of the amplifier is stable. This
ensure a fast response time. The only precaution to take is to be sure that the trig signal (PSC)
frequency is lower than ADCclk/4.
Bit
7
6543
2
1
0
ADC9
ADC8
ADC7
ADC6
ADC5
ADC4
ADC3
ADC2
ADCH
ADC1
ADC0
-
----
-
ADCL
Read/Write
R
RRRRR
R
RRRRR
Initial Value
0
0000
0
0000
0
Bit
7
65
43
21
0
ADC7D
ADC6D
ADC5D
ADC4D
ADC3D
ACMPM
ADC2D
ACMP2D
ADC1D
ADC0D
DIDR0
Read/Write
R/W
Initial Value
0
Bit
7
65
43
21
0
-
ACMP0D
AMP0PD
AMP0ND
DIDR1
Read/Write
-
R/W
Initial Value
0