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Sheet目录3841

115页 116页 117页 118页 [119页]120页 121页 122页 123页

2010-2012 Microchip Technology Inc.

DS39977F-page 205

PIC18F66K80 FAMILY

13.0

TIMER0 MODULE

The Timer0 module incorporates the following features:

Software selectable operation as a timer or

counter in both 8-bit or 16-bit modes

Readable and writable registers

Dedicated 8-bit, software programmable

prescaler

Selectable clock source (internal or external)

Edge select for external clock

Interrupt-on-overflow

The T0CON register (Register 13-1) controls all

aspects of the module’s operation, including the

prescale selection. It is both readable and writable.

Figure 13-1 provides a simplified block diagram of the

Timer0 module in 8-bit mode. Figure 13-2 provides a

simplified block diagram of the Timer0 module in 16-bit

mode.

REGISTER 13-1:

T0CON: TIMER0 CONTROL REGISTER

R/W-1

TMR0ON

T08BIT

T0CS

T0SE

PSA

T0PS2

T0PS1

T0PS0

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

TMR0ON:

Timer0 On/Off Control bit

= Enables Timer0

= Stops Timer0

bit 6

T08BIT

: Timer0 8-Bit/16-Bit Control bit

= Timer0 is configured as an 8-bit timer/counter

= Timer0 is configured as a 16-bit timer/counter

bit 5

T0CS

: Timer0 Clock Source Select bit

= Transitions on T0CKI pin

= Internal instruction cycle clock (CLKO)

bit 4

T0SE

: Timer0 Source Edge Select bit

= Increments on high-to-low transition on T0CKI pin

= Increments on low-to-high transition on T0CKI pin

bit 3

PSA

: Timer0 Prescaler Assignment bit

= Timer0 prescaler is not assigned; Timer0 clock input bypasses prescaler

= Timer0 prescaler is assigned; Timer0 clock input comes from prescaler output

bit 2-0

T0PS<2:0>

: Timer0 Prescaler Select bits

111

= 1:256 Prescale value

110

= 1:128 Prescale value

101

= 1:64 Prescale value

100

= 1:32 Prescale value

011

= 1:16 Prescale value

010

= 1:8

Prescale value

001

= 1:4

Prescale value

000

= 1:2

Prescale value

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