PIC18F4539-ESLASHMLSQTP datasheet(109/322 Pages) MICROCHIP

Part #	PIC18F4539-E/MLSQTP

Description	Enhanced FLASH Microcontrollers with Single Phase Induction Motor Control Kernel

PDF	322 Pages

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Manufacturer	MICROCHIP [Microchip Technology]

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109 / 322 page

 2002 Microchip Technology Inc.

Preliminary

DS30485A-page 107

PIC18FXX39

12.0 TIMER2 MODULE

The Timer2 module is an 8-bit timer with a selectable

8-bit period. It has the following features:

• Input from system clock at FOSC/4 with

programmable input prescaler

• Interrupt on timer-to-period match with

programmable postscaler

The module has three registers: the TMR2 counter, the

PR2 period register, and the T2CON control register.

The general operation of Timer2 is shown in

Figure 12-1.

Additional information on the use of Timer2 as a

time-base is available in Section 15.0 (PWM Modules).

FIGURE 12-1:

TIMER2 BLOCK DIAGRAM

Note:

In PIC18FXX39 devices, Timer2 is used

exclusively as a time-base for the PWM

modules in motor control applications. As

such, it is not available to users as a

resource. Although their locations are

shown on the device data memory maps,

none of the Timer2 registers are directly

accessible. Users should not alter the

values of these registers.

Comparator

TMR2

Sets Flag

TMR2

Output

RESET

Postscaler

Prescaler

PR2

FOSC/4

1:1 to 1:16

1:1, 1:4, 1:16

bit TMR2IF

(ProMPT Module)

(TMR2 = PR2)

(ProMPT Module)

PIC18F4539-E/MLSQTP Datasheet(PDF) 109 Page - Microchip Technology

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