AT90PWM81-16SN Atmel, AT90PWM81-16SN Datasheet - Page 220

• Manufacturer Part Number: AT90PWM81-16SN
• Description: IC MCU AVR 8K FLASH ISP 20SOIC
• Manufacturer: Atmel
• Series: AVR® 90PWM Lightingr

Specifications of AT90PWM81-16SN

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI
• Peripherals: Brown-out Detect/Reset, PWM, WDT
• Number Of I /o: 16
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 20-SOIC (7.5mm Width)
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: SPI
• Maximum Clock Frequency: 16 MHz
• Number Of Timers: 1
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• On-chip Dac: 10 bit, 1 Channel
• Height: 2.35 mm
• Length: 13 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Width: 7.6 mm
• For Use With: ATSTK600-SOIC - STK600 SOCKET/ADAPTER FOR SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

17.8.4
17.8.4.1
220
AT90PWM81
ADC Result Data Registers – ADCH and ADCL
ADLAR = 0
In case of trig on PSCnASY event, there is no flag. So, if ADSSEN is reset, a conversion will start each
time the trig event appears and the previous conversion is completed ..
Table 17-6.
When an ADC conversion is complete, the conversion results are stored in these two result data registers.
When the ADCL register is read, the two ADC result data registers can’t be updated until the ADCH reg-
ister has also been read.
Consequently, in 10-bit configuration, the ADCL register must be read first before the ADCH.
Nevertheless, to work easily with only 8-bit precision, there is the possibility to left adjust the result
thanks to the ADLAR bit in the ADCSRA register. Like this, it is sufficient to only read ADCH to have
the conversion result.
Bit
Read/Write
Initial Value
ADTS3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
ADC Auto Trigger Source Selection
7
-
ADC7
R
R
0
0
ADTS2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
6
-
ADC6
R
R
0
0
ADTS1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
5
-
ADC5
R
R
0
0
4
-
ADC4
R
R
0
0
ADTS0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
3
-
ADC3
R
R
0
0
Description
Free Running Mode
Analog Comparator 1
External Interrupt Request 0
Timer/Counter1 Overflow
Timer/Counter1 Capture Event
PSCRASY Event
PSC2ASY Event
Analog comparator 2
Analog comparator 3
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
2
-
ADC2
R
R
0
0
1
ADC9
ADC1
R
R
0
0
0
ADC8
ADC0
R
R
0
0
7734P–AVR–08/10
ADCH
ADCL