Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK Data Sheet
Product codes
AT91SAM9M10-G45-EK
105
SAM9M10 [DATASHEET]
6355F–ATARM–12-Mar-13
15. Periodic Interval Timer (PIT)
15.1
Description
The Periodic Interval Timer (PIT) provides the operating system’s scheduler interrupt. It is designed to offer maxi-
mum accuracy and efficient management, even for systems with long response time.
mum accuracy and efficient management, even for systems with long response time.
15.2
Embedded Characteristics
• Includes a 20-bit Periodic Counter, with less than 1μs accuracy
• Includes a 12-bit Interval Overlay Counter
• Real Time OS or Linux/WinCE compliant tick generator
15.3
Block Diagram
Figure 15-1.
Periodic Interval Timer
20-bit
Counter
MCK/16
PIV
PIT_MR
CPIV
PIT_PIVR
PICNT
12-bit
Adder
0
0
read PIT_PIVR
CPIV
PICNT
PIT_PIIR
PITS
PIT_SR
set
reset
PITIEN
PIT_MR
pit_irq
1
0
1
0
MCK
Prescaler
=