PIC16LF721 datasheet(89/254 Pages) MICROCHIP

89 / 254 page

 2010-2013 Microchip Technology Inc.

DS41430D-page 89

PIC16(L)F720/721

12.0 TIMER0 MODULE

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

following features:

• 8-bit timer/counter register (TMR0)

• 8-bit prescaler (shared with Watchdog Timer)

• Programmable internal or external clock source

• Programmable external clock edge selection

• Interrupt on overflow

• TMR0 can be used to gate Timer1

Figure 12-1 is a block diagram of the Timer0 module.

12.1

Timer0 Operation

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

or an 8-bit counter.

12.1.1

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 T0CS bit of the OPTION_REG

When TMR0 is written, the increment is inhibited for

two instruction cycles immediately following the write.

12.1.2

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 T0CS 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 T0SE bit in

the OPTION_REG register.

FIGURE 12-1:

BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER

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

T0SE

TMR0

WDT

Time-out

PS<2:0>

WDTEN

Data Bus

Set Flag bit T0IF

on Overflow

T0CS

8-bit

Prescaler

FOSC/4

PSA

SYNC

2 TCY

Overflow to Timer1

Divide by

512

TMR1GE

T1GSS = 11

Low-Power

WDT

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