PIC16F913 datasheet(92/272 Pages) MICROCHIP

92 / 272 page

PIC16F917/916/914/913

DS41250E-page 90

Preliminary

7.0

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 with PR2

Timer2 has a control register shown in Register 7-1.

TMR2 can be shut-off by clearing control bit TMR2ON

(T2CON<2>)

minimize

power

consumption.

Figure 7-1 is a simplified block diagram of the Timer2

module. The prescaler and postscaler selection of

Timer2 are controlled by this register.

7.1

Timer2 Operation

Timer2 can be used as the PWM time base for the

PWM mode of the CCP module. The TMR2 register is

readable and writable, and is cleared on any device

Reset. The input clock (FOSC/4) has a prescale option

of 1:1, 1:4 or 1:16, selected by control bits T2CKPSx

(T2CON<1:0>). The match output of TMR2 goes

through a 4-bit postscaler (which gives a 1:1 to 1:16

scaling inclusive) to generate a TMR2 interrupt (latched

in flag bit TMR2IF, (PIR1<1>)).

The prescaler and postscaler counters are cleared

when any of the following occurs:

• A write to the TMR2 register

• A write to the T2CON register

• Any device Reset (Power-on Reset, MCLR Reset,

Watchdog Timer Reset, or Brown-out Reset)

TMR2 is not cleared when T2CON is written.

T2CON – TIMER2 CONTROL REGISTER (ADDRESS: 12h)

U-0

R/W-0

—

TOUTPS3

TOUTPS2

TOUTPS1

TOUTPS0

TMR2ON T2CKPS1

T2CKPS0

bit 7

bit 0

bit 7

Unimplemented: Read as ‘0’

bit 6-3

TOUTPS<3:0>: Timer2 Output Postscale Select bits

0000

=1:1 Postscale

0001

=1:2 Postscale

•

1111

=1:16 Postscale

bit 2

TMR2ON: Timer2 On bit

= Timer2 is on

= Timer2 is off

bit 1-0

T2CKPS<1:0>: Timer2 Clock Prescale Select bits

=Prescaler is 1

=Prescaler is 4

=Prescaler is 16

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

- n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

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