Rainbow Electronics AT91CAP9S250A - Manual (Page 105)

105
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
17. Periodic Interval Timer (PIT)
17.1 Overview
The Periodic Interval Timer (PIT) provides the operating system’s scheduler interrupt. It is
designed to offer maximum accuracy and efficient management, even for systems with long
response time.
17.2 Block Diagram
Figure 17-1. 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
= ?