AT90PWM81-16MF Atmel, AT90PWM81-16MF Datasheet - Page 128

• Manufacturer Part Number: AT90PWM81-16MF
• Description: IC MCU AVR 8K FLASH ISP 32QFN
• Manufacturer: Atmel
• Series: AVR® 90PWM Lightingr

Specifications of AT90PWM81-16MF

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI
• Peripherals: Brown-out Detect/Reset, PWM, WDT
• Number Of I /o: 20
• 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 11x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 32-MLF®, QFN
• For Use With: ATSTK600-SOIC - STK600 SOCKET/ADAPTER FOR SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

12.18.1
12.18.2
12.18.3
128
AT90PWM81
Available Input Mode according to Running Mode
Event Capture
Using the Input Capture Unit
Some Input Modes are not consistent with some Running Modes. So the table below gives the input
modes which are valid according to running modes.
Table 12-8.
The PSC can capture the value of time (PSC counter) when a retrigger event or fault event occurs on PSC
inputs. This value can be read by software in PICRnH/L register.
The main challenge when using the Input Capture unit is to assign enough processor capacity for handling
the incoming events. The time between two events is critical. If the processor has not read the captured
value in the PICR1 Register before the next event occurs, the PICR1 will be overwritten with a new value.
In this case the result of the capture will be incorrect.
When using the Input Capture interrupt, the PICR1 Register should be read as early in the interrupt han-
dler routine as possible. Even though the Input Capture interrupt has relatively high priority, the maximum
interrupt response time is dependent on the maximum number of clock cycles it takes to handle any of the
other interrupt requests.
Input Mode Number
:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Available Input Modes according to Running Modes
1 Ramp Mode
Valid
Do not use
Do not use
Valid
Do not use
Do not use
Valid
Valid
Valid
Do not use
Valid
Do not use
2 Ramp Mode
Valid
Valid
Valid
Valid
Valid
Valid
Valid
Valid
Valid
Valid
4 Ramp Mode
Valid
Valid
Valid
Valid
Valid
Valid
Valid
Valid
Valid
Valid
Centered Mode
Do not use
Do not use
Do not use
Valid
Do not use
Do not use
Valid
Do not use
Do not use
Do not use
7734P–AVR–08/10