AT90PWM2B-16SE ATMEL [ATMEL Corporation], AT90PWM2B-16SE Datasheet - Page 156

• Manufacturer Part Number: AT90PWM2B-16SE
• Description: 8-bit Microcontroller with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

16.18.1
16.18.2
16.18.3
156
AT90PWM2/3/2B/3B
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 16-7.
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 sofware 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 PICRn Register before the next event occurs, the PICRn 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 PICRn Register should be read as early in the inter-
rupt handler 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
4317J–AVR–08/10