SAM7S256_14 Datasheet, PDF (81/775 Pages) ATMEL Corporation – ARM-based Flash MCU

15. Periodic Interval Timer (PIT)
15.1
Overview
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.
15.2 Block Diagram
Figure 15-1. Periodic Interval Timer
PIT_MR
PIV
=?
0
0
01
PIT_SR
set
PITS
reset
PIT_MR
PITIEN
pit_irq
MCK
01
20-bit
Counter
12-bit
Adder
read PIT_PIVR
MCK/16
Prescaler
CPIV
PIT_PIVR
PICNT
CPIV
PIT_PIIR
PICNT
SAM7S Series [DATASHEET] 81
6175M–ATARM–26-Oct-12