PIC16F1507-ESLASHSS. datasheet(131/278 Pages) MICROCHIP

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DS40001586D-page 131

PIC16(L)F1507

16.0

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 16-1 is a block diagram of the Timer0 module.

16.1

Timer0 Operation

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

or an 8-bit counter.

16.1.1

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.

16.1.2

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 16-1:

TIMER0 BLOCK DIAGRAM

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.

Rev. 10-000017A

8/5/2013

TMR0SE

Fosc/4

Prescaler

T0_overflow

write

TMR0

set bit

TMR0IF

T0CKI

Sync Circuit

FOSC/2

TMR0CS

T0CKI

(1)

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

PS<2:0>

PSA

TMR0

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