Atmel ATtiny13A User Manual

95
8126F–AVR–05/12
ATtiny13A
The ADLAR bit in ADMUX, and the MUXn bits in ADMUX affect the way the result is read from
the registers. If ADLAR is set, the result is left adjusted. If ADLAR is cleared (default), the result
is right adjusted.
• ADC[9:0]: ADC Conversion Result
These bits represent the result from the conversion, as detailed in “ADC Conversion Result” on
page 92.
14.12.4 ADCSRB – ADC Control and Status Register B
• Bits 7, 5:3 – Res: Reserved Bits
These bits are reserved bits in the ATtiny13A and will always read as zero.
• Bits 2:0 – ADTS[2:0]: 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 ADTS[2:0] settings will have no effect. A conver-
sion will be triggered by the rising edge of the selected Interrupt Flag. Note that switching from a
trigger 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
.
14.12.5 DIDR0 – Digital Input Disable Register 0
• Bits 5:2 – ADC3D:ADC0D: ADC[3:0] Digital Input Disable
When a bit is written logic one, the digital input buffer on the corresponding ADC pin is disabled.
The corresponding PIN register bit will always read as zero when this bit is set. When an analog
signal is applied to the ADC[7:0] 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 76543210
0x03 –
ACME – – – ADTS2 ADTS1 ADTS0 ADCSRB
Read/Write R R/W R R R R/W R/W R/W
Initial Value00000000
Table 14-5. ADC Auto Trigger Source Selections
ADTS2 ADTS1 ADTS0 Trigger Source
0 0 0 Free Running mode
0 0 1 Analog Comparator
0 1 0 External Interrupt Request 0
0 1 1 Timer/Counter Compare Match A
1 0 0 Timer/Counter Overflow
1 0 1 Timer/Counter Compare Match B
1 1 0 Pin Change Interrupt Request
Bit 76543210
0x14
– – ADC0D ADC2D ADC3D ADC1D AIN1D AIN0D DIDR0
Read/Write R R R/W R/W R/W R/W R/W R/W
Initial Value00000000

Atmel ATtiny13A Specifications

General

Brand	Atmel
Model	ATtiny13A
Category	Microcontrollers
Language	English