PIC16F1459-ESSQTP datasheet(183/418 Pages) MICROCHIP

183 / 418 page

 2012 Microchip Technology Inc.

Preliminary

DS41639A-page 183

PIC16(L)F1454/5/9

19.0 TIMER0 MODULE

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

following features:

• 8-bit timer/counter register (TMR0)

• 8-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 19-1 is a block diagram of the Timer0 module.

19.1

Timer0 Operation

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

or an 8-bit counter.

19.1.1

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.

19.1.2

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 19-1:

BLOCK DIAGRAM OF THE TIMER0

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.

T0CKI

TMR0SE

TMR0

PS<2:0>

Data Bus

Set Flag bit TMR0IF

on Overflow

TMR0CS

8-bit

Prescaler

FOSC/4

PSA

Sync

2 TCY

Overflow to Timer1

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