MMC2107 - Freescale Semiconductor

Freescale Semiconductor, Inc.
Programmable Interrupt Timer Modules (PIT1 and PIT2)
14.2 Introduction
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 latch, or it can be a free-running down-counter.
This device has two programmable interrupt timers. PIT1 has a base
address located at 0x00c8_0000. PIT2 base address is 0x00c9_0000.
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14.3 Block Diagram
Freescale Semiconductor, I
SYSTEM
CLOCK
PRESCALER
EN
PRE[3:0]
PDOZE
PDBG
OVW
IPBUS
16-BIT PCNTR
16-BIT PIT COUNTER
16-BIT PMR
IPBUS
RLD
COUNT = 0
LOAD
COUNTER
Figure 14-1. PIT Block Diagram
PIF
PIE
TO INTERRUPT
CONTROLLER
Technical Data MMC2107 – Rev. 2.0
282 Programmable Interrupt Timer Modules (PIT1 and PIT2) MOTOROLA
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