Motorola MCF5281 사용자 설명서
MOTOROLA
Chapter 19. Programmable Interrupt Timer Modules (PIT0–PIT3)
19-1
Chapter 19
Programmable Interrupt Timer Modules
(PIT0–PIT3)
19.1 Overview
The programmable interrupt timer (PIT) is a 16-bit timer that provides precise interrupts at
regular intervals with minimal processor intervention. The timer can either count down
from the value written in the modulus register, or it can be a free-running down-counter.
This device has four programmable interrupt timers, PIT0–PIT3.
regular intervals with minimal processor intervention. The timer can either count down
from the value written in the modulus register, or it can be a free-running down-counter.
This device has four programmable interrupt timers, PIT0–PIT3.
19.2 Block Diagram
Figure 19-1. PIT Block Diagram
16-bit PMR
16-bit PIT Counter
COUNT = 0
System
Clock
IPBUS
16-bit PCNTR
IPBUS
EN
OVW
DOZE
HALTED
Prescaler
PRE[3:0]
RLD
PIF
PIE
Load
Counter
To Interrupt
Controller
Divide
by 2