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Programmable Interrupt Timer (PIT)
13.3 Features
13.4 Functional Description
INTERNAL
BUS CLOCK
PSTOP
PRST
16-BIT COUNTER
16-BIT COMPARATOR
PMODH:PMODL
Technical Data
222
Features of the PIT include the following:
•
Programmable PIT clock input
•
Free-running or modulo up-count operation
•
PIT counter stop and reset bits
Figure 13-1
shows the structure of the PIT. The central component of
the PIT is the 16-bit PIT counter that can operate as a free-running
counter or a modulo up-counter. The counter provides the timing
reference for the interrupt. The PIT counter modulo registers,
PMODH:PMODL, control the modulo value of the counter. Software can
read the counter value at any time without affecting the counting
sequence.
PRESCALER SELECT
PRESCALER
PPS2
Figure 13-1. PIT Block Diagram
Programmable Interrupt Timer (PIT)
PPS1
PPS0
POF
POIE
MC68HC908AB32
INTERRUPT
LOGIC
Rev. 1.0
—
MOTOROLA
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