MPC8280 datasheet(639/1386 Pages) FREESCALE

639 / 1386 page

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

18-1

Chapter 18

Timers

The CPM includes four identical 16-bit general-purpose timers or two 32-bit timers. Each general-purpose

timer consists of a timer mode register (TMR), a timer capture register (TCR), a timer counter (TCN), a

timer reference register (TRR), a timer event register (TER), and a timer global configuration register

(TGCR). The TMRs contain the prescaler values programmed by the user.

Figure 18-1 shows the timer block diagram.

Figure 18-1. Timer Block Diagram

Pin assignments for TINx, TGATEx, and TOUTx are described in Section 41.5, “Ports Tables.”

18.1

Features

The key features of the timer include the following:

•

The maximum input clock is the bus clock

•

Maximum period of 4 seconds (at 66 MHz)

Timer

Capture

Detection

Timer Event Register

Mode Register

Mode Bits

Prescaler

Timer Counter (TCN)

Capture Register

Reference Register

Divider

Clock

TER1

TMR1

TCN1

TRR1

TCR1

Bus

TIN1

TOUT1

Timer1

Timer2

Timer3

Timer4

Global Configuration Register

TGATE1

TGATE2

TGCR

TIN2

TIN3

TIN4

TOUT2

TOUT3

TOUT4

Clock

Generator

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