PIC18LF4580ISOSQTP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18LF4580ISOSQTP

28/40/44-Pin Enhanced Flash Microcontrollers with ECAN™ Technology, 10-Bit A/D and nanoWatt Technology

Microchip Technology 

PIC18F2480/2580/4480/4580

14.2 Timer2 Interrupt

Timer2 also can generate an optional device interrupt.

The Timer2 output signal (TMR2 to PR2 match)

provides the input for the 4-bit output counter/post-

scaler. This counter generates the TMR2 match inter-

rupt flag which is latched in TMR2IF (PIR1<1>). The

interrupt is enabled by setting the TMR2 Match Inter-

rupt Enable bit, TMR2IE (PIE1<1>).

A range of 16 postscale options (from 1:1 through 1:16

inclusive) can be selected with the postscaler control

bits, T2OUTPS<3:0> (T2CON<6:3>).

FIGURE 14-1:

TIMER2 BLOCK DIAGRAM

T2OUTPS<3:0>

2

T2CKPS<1:0>

FOSC/4

1:1, 1:4, 1:16

Prescaler

Internal Data Bus

4

Reset

TMR2

8

14.3 TMR2 Output

The unscaled output of TMR2 is available primarily to

the CCP modules, where it is used as a time base for

operations in PWM mode.

Timer2 can be optionally used as the shift clock source

for the MSSP module operating in SPI mode. Addi-

tional information is provided in Section 18.0 “Master

Synchronous Serial Port (MSSP) Module”.

1:1 to 1:16

Postscaler

TMR2/PR2

Match

Comparator

8

Set TMR2IF

TMR2 Output

(to PWM or MSSP)

PR2

8

TABLE 14-1: REGISTERS ASSOCIATED WITH TIMER2 AS A TIMER/COUNTER

Name Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Reset

Values

on Page:

INTCON GIE/GIEH PEIE/GIEL TMR0IE INT0IE

RBIE TMR0IF INT0IF RBIF

55

PIR1

PSPIF(1)

ADIF

RCIF

TXIF

SSPIF CCP1IF TMR2IF TMR1IF

58

PIE1

PSPIE(1)

ADIE

RCIE

TXIE

SSPIE CCP1IE TMR2IE TMR1IE

58

IPR1

PSPIP(1)

ADIP

RCIP

TXIP

SSPIP CCP1IP TMR2IP TMR1IP

58

TMR2 Timer2 Register

56

T2CON

— T2OUTPS3 T2OUTPS2 T2OUTPS1 T2OUTPS0 TMR2ON T2CKPS1 T2CKPS0 56

PR2 Timer2 Period Register

56

Legend: — = unimplemented, read as ‘0’. Shaded cells are not used by the Timer2 module.

Note 1: These bits are unimplemented on PIC18F2X80 devices; always maintain these bits clear.

DS39637D-page 162

© 2009 Microchip Technology Inc.

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