MC68HC08AZ32A Datasheet, PDF (284/456 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Programmable Interrupt Timer (PIT)
18.3 Features
Features of the PIT include:
• Programmable PIT Clock Input
• Free-Running or Modulo Up-Count Operation
• PIT Counter Stop and Reset Bits
18.4 Functional Description
Figure 18-1 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.
INTERNAL
BUS CLOCK
PRESCALER
CSTOP
CRST
16-BIT COUNTER
PRESCALER SELECT
PPS2 PPS1 PPS0
16-BIT COMPARATOR
PMODH:PMODL
Figure 18-1. PIT Block Diagram
POF
INTER-
RUPT
POIE
LOGIC
Technical Data
284
MC68HC08AZ32A — Rev 1.0
Programmable Interrupt Timer (PIT)
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