PIC16LC712 datasheet(36/106 Pages) MICROCHIP

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PIC16C712/716

DS41106C-page 36

 1999-2013 Microchip Technology Inc.

6.0

TIMER2 MODULE

The Timer2 module timer has the following features:

• 8-bit timer (TMR2 register)

• 8-bit period register (PR2)

• Readable and writable (both registers)

• Software programmable prescaler (1:1, 1:4, 1:16)

• Software programmable postscaler (1:1 to 1:16)

• Interrupt on TMR2 match of PR2

Timer2 has a control register, shown in Figure 6-1.

Timer2 can be shut off by clearing control bit TMR2ON

(T2CON<2>) to minimize power consumption.

Figure 6-2 is a simplified block diagram of the Timer2

module.

Additional information on timer modules is available in

the PIC® Mid-Range Reference Manual, (DS33023).

FIGURE 6-1:

T2CON: TIMER2 CONTROL REGISTER (ADDRESS 12h)

FIGURE 6-2:

TIMER2 BLOCK DIAGRAM

U-0

R/W-0

—

TOUTPS3 TOUTPS2 TOUTPS1 TOUTPS0

TMR2ON

T2CKPS1 T2CKPS0

= Readable bit

W = Writable bit

= Unimplemented bit,

read as ‘0’

-n = Value at POR Reset

bit7

bit0

bit 7:

Unimplemented: Read as ‘0’

bit 6-3:

TOUTPS3:TOUTPS0: Timer2 Output Postscale Select bits

0000

= 1:1 Postscale

0001

= 1:2 Postscale

0010

= 1:3 Postscale

0011

= 1:4 Postscale

0100

= 1:5 Postscale

0101

= 1:6 Postscale

0110

= 1:7 Postscale

0111

= 1:8 Postscale

1000

= 1:9 Postscale

1001

= 1:10 Postscale

1010

= 1:11 Postscale

1011

= 1:12 Postscale

1100

= 1:13 Postscale

1101

= 1:14 Postscale

1110

= 1:15 Postscale

1111

= 1:16 Postscale

bit 2:

TMR2ON: Timer2 On bit

= Timer2 is on

= Timer2 is off

bit 1-0:

T2CKPS1:T2CKPS0: Timer2 Clock Prescale Select bits

= Prescaler is 1

= Prescaler is 4

= Prescaler is 16

Comparator

TMR2

Sets flag

TMR2 Reg

output

Reset

Postscaler

Prescaler

PR2 Reg

FOSC/4

1:1

1:16

1:1, 1:4, 1:16

bit TMR2IF

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