PIC10LF322T-EMCSQTP datasheet(102/210 Pages) MICROCHIP

102 / 210 page

PIC10(L)F320/322

DS41585A-page 102

Preliminary

 2011 Microchip Technology Inc.

16.1.3

SOFTWARE PROGRAMMABLE

PRESCALER

A single software programmable prescaler is available

for use with Timer0. The prescaler assignment is

controlled by the PSA bit of the OPTION_REG register.

To assign the prescaler to Timer0, the PSA bit must be

cleared to a ‘0’.

There are 8 prescaler options for the Timer0 module

ranging from 1:2 to 1:256. The prescale values are

selectable via the PS<2:0> bits of the OPTION_REG

The prescaler is not readable or writable. When

assigned to the Timer0 module, all instructions writing to

the TMR0 register will clear the prescaler.

16.1.4

TIMER0 INTERRUPT

Timer0 will generate an interrupt when the TMR0

interrupt flag bit of the INTCON register is set every

time the TMR0 register overflows, regardless of

whether or not the Timer0 interrupt is enabled. The

TMR0IF bit can only be cleared in software. The Timer0

interrupt enable is the TMR0IE bit of the INTCON

16.1.5

8-BIT COUNTER MODE

SYNCHRONIZATION

When in 8-Bit Counter mode, the incrementing edge on

the T0CKI pin must be synchronized to the instruction

clock. Synchronization can be accomplished by

sampling the prescaler output on the Q2 and Q4 cycles

of the instruction clock. The high and low periods of the

external clocking source must meet the timing

requirements as shown in Section 24.0 “Electrical

Specifications”

Note:

The Timer0 interrupt cannot wake the

processor from Sleep since the timer is

frozen during Sleep.

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