PIC18LF4331-ESLASHML datasheet(136/392 Pages) MICROCHIP

136 / 392 page

PIC18F2331/2431/4331/4431

DS39616D-page 136

 2010 Microchip Technology Inc.

14.0

TIMER2 MODULE

The Timer2 module has the following features:

• 8-bit Timer register (TMR2)

• 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

• SSP module optional use of TMR2 output to

generate clock shift

Timer2 has a control register, shown in Register 14-1.

TMR2 can be shut off by clearing control bit, TMR2ON

(T2CON<2>),

minimize

power

consumption.

Figure 14-1 is a simplified block diagram of the Timer2

module. Register 14-1 shows the Timer2 Control

Timer2 are controlled by this register.

14.1

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,

T2CKPS<1:0> (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 TMR2 and PR2 registers are both directly readable

and writable. The TMR2 register is cleared on any

device Reset, while the PR2 register initializes at FFh.

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

U-0

R/W-0

—

TOUTPS3

TOUTPS2

TOUTPS1

TOUTPS0

TMR2ON

T2CKPS1

T2CKPS0

bit 7

bit 0

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

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

PIC18LF4331-E/ML Datasheet(PDF) 136 Page - Microchip Technology

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