PIC18F4515T-I/PT【PDF 17/234 页】IC MCU FLASH 24KX16 44TQFP

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2009 Microchip Technology Inc.

DS39636D-page 115

PIC18F2X1X/4X1X

10.0 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 10-1) controls all

aspects of the module’s operation, including the

prescale selection. It is both readable and writable.

A simplified block diagram of the Timer0 module in 8-Bit

mode is shown in Figure 10-1. Figure 10-2 shows a

simplified block diagram of the Timer0 module in 16-Bit

mode.

REGISTER 10-1:

T0CON: TIMER0 CONTROL REGISTER

R/W-1

TMR0ON

T08BIT

T0CS

T0SE

PSA

T0PS2

T0PS1

T0PS0

bit 7

bit 0

bit 7

TMR0ON: Timer0 On/Off Control bit

1 = Enables Timer0

0 = Stops Timer0

bit 6

T08BIT: Timer0 8-bit/16-bit Control bit

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

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

bit 5

T0CS: Timer0 Clock Source Select bit

1 = Transition on T0CKI pin

0 = Internal instruction cycle clock (CLKO)

bit 4

T0SE: Timer0 Source Edge Select bit

1 = Increment on high-to-low transition on T0CKI pin

0 = Increment on low-to-high transition on T0CKI pin

bit 3

PSA: Timer0 Prescaler Assignment bit

1 = TImer0 prescaler is NOT assigned. Timer0 clock input bypasses prescaler.

0 = Timer0 prescaler is assigned. Timer0 clock input comes from prescaler output.

bit 2-0

T0PS2:T0PS0: 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

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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