MC68HC08AB16A Datasheet, PDF (213/380 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Technical Data — MC68HC08AB16A
Section 13. Programmable Interrupt Timer (PIT)
13.1 Contents
13.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
13.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
13.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
13.4.1 PIT Counter Prescaler . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
13.5 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
13.5.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
13.5.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
13.6 PIT During Break Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . 216
13.7 I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
13.7.1 PIT Status and Control Register. . . . . . . . . . . . . . . . . . . . . 217
13.7.2 PIT Counter Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
13.7.3 PIT Counter Modulo Registers . . . . . . . . . . . . . . . . . . . . . . 220
13.2 Introduction
This section describes the programmable interrupt timer (PIT), which is
a timer whose counter is clocked internally via software programmable
options. Figure 13-1 is a block diagram of the PIT.
MC68HC08AB16A — Rev. 2.0
MOTOROLA
Programmable Interrupt Timer (PIT)
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Technical Data
213