MC68HC908AB32 Datasheet, PDF (221/392 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Technical Data — MC68HC908AB32
Section 13. Programmable Interrupt Timer (PIT)
13.1 Contents
13.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
13.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
13.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .222
13.4.1 PIT Counter Prescaler . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223
13.5 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
13.5.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .224
13.5.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .224
13.6 PIT During Break Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . 224
13.7 I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
13.7.1 PIT Status and Control Register. . . . . . . . . . . . . . . . . . . . . 225
13.7.2 PIT Counter Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
13.7.3 PIT Counter Modulo Registers . . . . . . . . . . . . . . . . . . . . . . 228
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.
MC68HC908AB32 — Rev. 1.1
Freescale Semiconductor
Programmable Interrupt Timer (PIT)
Technical Data
221