PIC18C452T-E/L【PDF 6/279 页】IC MCU OTP 16KX16 A/D 44PLCC

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Sheet目录3889

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2001 Microchip Technology Inc.

DS39206C-page 101

PIC18CXX2

11.0

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

SSP module optional use of TMR2 output to gen-

erate clock shift

Timer2 has a control register shown in Register 11-1.

Timer2 can be shut-off by clearing control bit TMR2ON

(T2CON<2>)

minimize

power

consumption.

Figure 11-1 is a simplified block diagram of the Timer2

module. Register 11-1 shows the Timer2 control regis-

ter. The prescaler and postscaler selection of Timer2

are controlled by this register.

11.1

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,

1:16, selected

control bits

T2CKPS1:T2CKPS0 (T2CON<1:0>). The match out-

put 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.

REGISTER 11-1:

T2CON: TIMER2 CONTROL REGISTER

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

TOUTPS3:TOUTPS0: 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

T2CKPS1:T2CKPS0: 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 reset

’1’ = Bit is set

’0’ = Bit is cleared

x = Bit is unknown

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