PIC16F1516 datasheet(155/344 Pages) MICROCHIP

155 / 344 page

 2011 Microchip Technology Inc.

Preliminary

DS41452B-page 155

PIC16(L)F1516/7/8/9

17.0

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 17-1 is a block diagram of the Timer0 module.

17.1

Timer0 Operation

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

or an 8-bit counter.

17.1.1

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.

17.1.2

8-BIT COUNTER MODE

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

on either the rising or falling edge of the T0CKI pin. The

edge that increments the counter is determined by the

TMR0SE bit in the OPTION_REG register. TMR0SE = 1

selects the falling edge.

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

by setting the TMR0CS bit in the OPTION_REG register

to ‘1’.

FIGURE 17-1:

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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