MC68340 datasheet(345/441 Pages) FREESCALE

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MOTOROLA

MC68340 USER’S MANUAL

8- 1

SECTION 8

TIMER MODULES

Each MC68340 timer module contains a counter/timer (timer 1 and timer 2) as shown in

Figure 8-1. Each timer interfaces directly to the CPU32 via the intermodule bus (IMB).

Each timer consists of the following major areas:

• A General-Purpose Counter/Timer

• Internal Control Logic

• Interrupt Control Logic

TIMER 2

INTERRUPT

CONTROL

LOGIC

IMB

INTERFACE

TIN2

TOUT2

TGATE2

TIMER 2

TIMER 1

INTERRUPT

CONTROL

LOGIC

IMB

INTERFACE

TIN1

TOUT1

TGATE1

TIMER 1

Figure 8-1. Simplified Block Diagram

8.1 MODULE OVERVIEW

Each timer module consists of the following functional features:

• Versatile General-Purpose Timer

• 8-Bit Prescaler/16-Bit Counter

• Timers Can Be Externally Cascaded for a Maximum Count Width of 48 Bits

• Programmable Timer Modes:

— Input Capture/Output Compare

— Square-Wave Generation

— Variable Duty-Cycle Square-Wave Generation

— Variable-Width Single-Shot Pulse Generation

Freescale Semiconductor, Inc.

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