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Additional info for US Air Force - AFQTP - 3E1X1-16 - heating,ventilation, air conditioning (HVAC), refrigeration
Timer/Counter1 is implemented as an up-counter with read and write access. Due to synchronization of the CPU and Timer/Counter1, data written into Timer/Counter1 is delayed by one CPU clock cycle. 30 ATtiny15L 1187F–AVR–06/05 ATtiny15L Timer/Counter1 Output Compare RegisterA – OCR1A Bit 7 6 5 4 3 2 1 0 $2E MSB LSB Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 OCR1A The Output Compare Register 1A is an 8-bit read/write register. The Timer/Counter Output Compare Register 1A contains the data to be continuously compared with Timer/Counter1.
If some Port B pins are used as digital outputs, it is essential that these do not switch while a conversion is in progress. 0 MΩ ATtiny15L 1187F–AVR–06/05 ATtiny15L I/O Port B All AVR ports have true read-modify-write functionality when used as general digital I/O ports. This means that the direction of one port pin can be changed without unintentionally changing the direction of any other pin with the SBI and CBI instructions. The same applies for changing drive value (if configured as output) or enabling/disabling of pull-up resistors (if configured as input).
56V reference may be selected as the ADC voltage reference. 56V internal voltage reference may be decoupled by an external capacitor at the AREF pin to improve noise immunity. 0 bits in ADMUX. 0 can be selected as singleended inputs to the ADC. ADC2 and ADC3 can be selected as positive and negative input, respectively, to the differential gain amplifier. 0 bits in ADMUX. This amplified value then becomes the analog input to the ADC. If single-ended channels are used, the gain amplifier is bypassed altogether.