PIC16F722-ESLASHML datasheet(111/302 Pages) MICROCHIP

111 / 302 page

DS41341E-page 111

PIC16F72X/PIC16LF72X

11.0

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 11-1 is a block diagram of the Timer0 module.

11.1

Timer0 Operation

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

or an 8-bit counter.

11.1.1

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

When TMR0 is written, the increment is inhibited for

two instruction cycles immediately following the write.

11.1.2

8-BIT COUNTER MODE

In 8-Bit Counter mode, the Timer0 module will

increment on every rising or falling edge of the T0CKI

pin or the Capacitive Sensing Oscillator (CPSOSC)

signal.

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

setting the T0CS bit in the OPTION register to ‘1’ and

resetting the T0XCS bit in the CPSCON0 register to ‘0’.

8-Bit Counter Mode using the Capacitive Sensing

Oscillator (CPSOSC) signal is selected by setting the

T0CS bit in the OPTION register to ‘1’ and setting the

T0XCS bit in the CPSCON0 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 register.

FIGURE 11-1:

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>

WDTE

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

Cap. Sensing

T0XCS

Oscillator

Low-Power

WDT OSC

PIC16F722-E/ML Datasheet(PDF) 111 Page - Microchip Technology

PIC16F722-E/ML Datasheet(HTML) 111 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL