ATTINY85-15ST1 Atmel, ATTINY85-15ST1 Datasheet - Page 127

• Manufacturer Part Number: ATTINY85-15ST1
• Description: MCU AVR 8K FLASH 15MHZ 8-SOIC
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY85-15ST1

• Package / Case: 8-SOIC (3.9mm Width)
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 105°C
• Speed: 16MHz
• Number Of I /o: 6
• Eeprom Size: 512 x 8
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Program Memory Size: 8KB (8K x 8)
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Connectivity: USI
• Core Size: 8-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

18.7.9
7598H–AVR–07/09
Digital Input Disable Register 0 – DIDR0
• Bit 5 – IPR: Input Polarity Mode
The Input Polarity mode allows software selectable differential input pairs and full 10 bit ADC
resolution, in the unipolar input mode, assuming a pre-determined input polarity. If the input
polarity is not known it is actually possible to determine the polarity first by using the bipolar input
mode (with 9 bit resolution + 1 sign bit ADC measurement). And once determined, set or clear
the polarity reversal bit, as needed, for a succeeding 10 bit unipolar measurement.
• Bits 4..3 – Res: Reserved Bits
These bits are reserved bits in the ATtiny25/45/85 and will always read as zero.
• Bits 2:0 – ADTS2:0: ADC Auto Trigger Source
If ADATE in ADCSRA is written to one, the value of these bits selects which source will trigger
an ADC conversion. If ADATE is cleared, the ADTS2:0 settings will have no effect. A conversion
will be triggered by the rising edge of the selected Interrupt Flag. Note that switching from a trig-
ger source that is cleared to a trigger source that is set, will generate a positive edge on the
trigger signal. If ADEN in ADCSRA is set, this will start a conversion. Switching to Free Running
mode (ADTS[2:0]=0) will not cause a trigger event, even if the ADC Interrupt Flag is set.
Table 18-6.
• Bits 5..2 – ADC3D..ADC0D: ADC3..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 ADC3..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.
Bit
Read/Write
Initial Value
ADTS2
0
0
0
0
1
1
1
ADC Auto Trigger Source Selections
R
7
–
0
ADTS1
R
6
–
0
0
0
1
1
0
0
1
ADC0D
R/W
5
0
ADC2D
R/W
ADTS0
4
0
0
1
0
1
0
1
0
ADC3D
R/W
3
0
Trigger Source
Free Running mode
Analog Comparator
External Interrupt Request 0
Timer/Counter Compare Match A
Timer/Counter Overflow
Timer/Counter Compare Match B
Pin Change Interrupt Request
ADC1D
R/W
2
0
ATtiny25/45/85
AIN1D
R/W
1
0
AIN0D
R/W
0
0
DIDR0
127