MC68HC08AZ0 Datasheet, PDF (301/444 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
Programmable Interrupt Timer (PIT)
PIT
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299
Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300
PIT counter prescaler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301
Low-power modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301
WAIT mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301
STOP mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301
PIT during break interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302
I/O registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303
PIT status and control register (PSC) . . . . . . . . . . . . . . . . . . . . . . 303
PIT counter registers (PCNTH:PCNTL) . . . . . . . . . . . . . . . . . . . . 305
PIT Counter modulo registers (PMODH:PMODL) . . . . . . . . . . . . 306
Introduction
This section describes the periodic interrupt timer module (PIT). Figure
1 is a block diagram of the PIT.
Features
Features of the PIT include the following:
• Programmable PIT Clock Input
• Free-Running or Modulo Up-Count Operation
• PIT Counter Stop and Reset Bits
1-pit
MOTOROLA
Programmable Interrupt Timer (PIT)
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MC68HC08AZ0
299