AT90PWM81 Atmel Corporation, AT90PWM81 Datasheet - Page 224
AT90PWM81
Manufacturer Part Number
AT90PWM81
Description
Manufacturer
Atmel Corporation
Datasheet
1.AT90PWM161.pdf
(325 pages)
Specifications of AT90PWM81
Flash (kbytes)
8 Kbytes
Pin Count
20
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
Hardware Qtouch Acquisition
No
Max I/o Pins
20
Ext Interrupts
3
Usb Speed
No
Usb Interface
No
Spi
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
11
Adc Resolution (bits)
10
Adc Speed (ksps)
125
Analog Comparators
3
Resistive Touch Screen
No
Dac Channels
1
Dac Resolution (bits)
10
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
0.25
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 125
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
1
Output Compare Channels
8
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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17.10 Amplifier Control Registers
17.10.1
224
AT90PWM81
Amplifier 0 Control and Status register – AMP0CSR
Figure 17-17. Amplifiers block diagram
If APMP0GS bit is set, the AMP0- input is open and PD5/AMP0- pin is free for another use. At the same
time the negative input of the Amplifier is internally grounded.
The configuration of the amplifier is controlled via the register AMP0CSR. Then the start of conversion is
done via the ADC control and status registers.
The conversion result is stored on ADCH and ADCL register which contain respectively the most signifi-
cant bits and the least significant bits.
Bit
Read/Write
Initial Value
• Bit 7 – AMP0EN: Amplifier 0 Enable Bit
Set this bit to enable the Amplifier 0.
Clear this bit to disable the Amplifier 0.
Clearing this bit while a conversion is running will take effect at the end of the conversion.
• Bit 6– AMP0IS: Amplifier 0 Input Shunt
Set this bit to short-circuit the Amplifier 0 input. If AMP0GS is set, the ground switch is released during
shunt of inputs.
Clear this bit to normally use the Amplifier 0.
AMP0+
AMP0-
7
AMP0EN
R/W
0
AMP0EN AMP0IS AMP0G1 AMP0G0
6
AMP0IS
R/W
0
no short
AMP0+ GND
Sampling
5
AMP0G1
R/W
0
Clock
4
AMP0G0
R/W
0
+
-
AMP0CSR
3
AMP0GS
-
0
00
01
10
1 1
AMP0GS
2
-
-
0
ADCK/8
PSCRASY
PSC2ASY
R/W
1
AMP0TS1
0
-
AMP0TS1 AMP0TS0
T oward ADC MUX
0
AMP0TS0
R/W
0
(AMP0)
7734P–AVR–08/10
AMP0CSR
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