PIC18F6X2X datasheet(152/386 Pages) MICROCHIP

152 / 386 page

PIC18F6X2X/8X2X

DS39612A-page 150

Advance Information

 2003 Microchip Technology Inc.

15.2

Timer4 Interrupt

The Timer4 module has an 8-bit period register, PR4,

which is both readable and writable. Timer4 increments

from 00h until it matches PR4 and then resets to 00h on

the next increment cycle. The PR4 register is initialized

to FFh upon RESET.

15.3

Output of TMR4

The output of TMR4 (before the postscaler) is used

only as a PWM time base for the CCP modules. It is not

used as a baud rate clock for the MSSP, as is the

Timer2 output.

FIGURE 15-1:

TIMER4 BLOCK DIAGRAM

TABLE 15-1:

REGISTERS ASSOCIATED WITH TIMER4 AS A TIMER/COUNTER

Comparator

TMR4

Sets Flag

TMR4

Output(1)

RESET

Postscaler

Prescaler

PR4

FOSC/4

1:1 to 1:16

1:1, 1:4, 1:16

bit TMR4IF

T4OUTPS3:T4OUTPS0

T4CKPS1:T4CKPS0

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on

POR, BOR

Value on

all other

RESETS

INTCON GIE/GIEH PEIE/GIEL

TMR0IE

INT0IE

RBIE

TMR0IF

INT0IF

RBIF

0000 0000 0000 0000

IPR3

—

RC2IP

TX2IP

TMR4IP

CCP5IP

CCP4IP

CCP3IP

--11 1111 --00 0000

PIR3

—

RC2IF

TX2IF

TMR4IF

CCP5IF

CCP4IF

CCP3IF

--00 0000 --00 0000

PIE3

—

RC2IE

TX2IE

TMR4IE

CCP5IE

CCP4IE

CCP3IE

--00 0000 --00 0000

TMR4

Timer4 Module Register

0000 0000 0000 0000

T4CON

—

T4OUTPS3 T4OUTPS2 T4OUTPS1 T4OUTPS0 TMR4ON T4CKPS1 T4CKPS0 -000 0000 -000 0000

PR4

Timer4 Period Register

1111 1111 1111 1111

Legend:

= unknown, u = unchanged, - = unimplemented, read as ‘0’. Shaded cells are not used by the Timer4 module.

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