PIC16F1503T-I View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F1503T-I

14-Pin Flash, 8-Bit Microcontrollers

Microchip Technology 

PIC16(L)F1503

18.0 TIMER0 MODULE

The Timer0 module is an 8-bit timer/counter with the

following features:

• 8-bit timer/counter register (TMR0)

• 3-bit prescaler (independent of Watchdog Timer)

• Programmable internal or external clock source

• Programmable external clock edge selection

• Interrupt on overflow

• TMR0 can be used to gate Timer1

Figure 18-1 is a block diagram of the Timer0 module.

18.1 Timer0 Operation

The Timer0 module can be used as either an 8-bit timer

or an 8-bit counter.

18.1.1 8-BIT TIMER MODE

The Timer0 module will increment every instruction

cycle, if used without a prescaler. 8-bit Timer mode is

selected by clearing the TMR0CS bit of the

OPTION_REG register.

When TMR0 is written, the increment is inhibited for

two instruction cycles immediately following the write.

Note:

The value written to the TMR0 register

can be adjusted, in order to account for

the two instruction cycle delay when

TMR0 is written.

18.1.2 8-BIT COUNTER MODE

In 8-Bit Counter mode, the Timer0 module will increment

on every rising or falling edge of the T0CKI pin.

8-Bit Counter mode using the T0CKI pin is selected by

setting the TMR0CS bit in the OPTION_REG register to

‘1’.

The rising or falling transition of the incrementing edge

for either input source is determined by the TMR0SE bit

in the OPTION_REG register.

FIGURE 18-1:

TIMER0 BLOCK DIAGRAM

TMR0CS

Fosc/4

T0CKI(1)

TMR0SE

PSA

0

1 write

to

TMR0

Prescaler

R

PS<2:0>

1

0 FOSC/2

T0CKI

Sync Circuit Q1

Rev. 10-000017A

8/5/2013

TMR0

T0_overflow

set bit

TMR0IF

Note 1: The T0CKI prescale output frequency should not exceed FOSC/8.

 2011-2015 Microchip Technology Inc.

DS40001607D-page 137

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