MC68HC08AZ32 Datasheet, PDF (281/424 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
Programmable Interrupt Timer (PIT)
PIT
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279
Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280
PIT counter prescaler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281
Low-power modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281
WAIT mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281
STOP mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281
PIT during break interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282
I/O registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283
PIT status and control register (PSC) . . . . . . . . . . . . . . . . . . . . . . 283
PIT counter registers (PCNTH:PCNTL) . . . . . . . . . . . . . . . . . . . . 285
PIT Counter modulo registers (PMODH:PMODL) . . . . . . . . . . . . 286
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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MC68HC08AZ32
279