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PIC12F683 Datasheet(PDF) 41 Page - Microchip Technology

Part # PIC12F683
Description  8-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC12F683 Datasheet(HTML) 41 Page - Microchip Technology

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 2004 Microchip Technology Inc.
Preliminary
DS41211B-page 39
PIC12F683
5.0
TIMER0 MODULE
The Timer0 module timer/counter has the following
features:
• 8-bit timer/counter
• Readable and writable
• 8-bit software programmable prescaler
• Internal or external clock select
• Interrupt on overflow from FFh to 00h
• Edge select for external clock
Figure 5-1 is a block diagram of the Timer0 module and
the prescaler shared with the WDT.
5.1
Timer0 Operation
Timer mode is selected by clearing the T0CS bit
(OPTION_REG<5>). In Timer mode, the Timer0
module will increment every instruction cycle (without
prescaler). If TMR0 is written, the increment is inhibited
for the following two instruction cycles. The user can
work around this by writing an adjusted value to the
TMR0 register.
Counter mode is selected by setting the T0CS bit
(OPTION_REG<5>). In this mode, the Timer0 module
will increment either on every rising or falling edge of
pin GP2/T0CKI. The incrementing edge is determined
by
the
source
edge
(T0SE)
control
bit
(OPTION_REG<4>). Clearing the T0SE bit selects the
rising edge.
5.2
Timer0 Interrupt
A Timer0 interrupt is generated when the TMR0
register timer/counter overflows from FFh to 00h. This
overflow sets the T0IF bit (INTCON<2>). The interrupt
can be masked by clearing the T0IE bit (INTCON<5>).
The T0IF bit must be cleared in software by the Timer0
module Interrupt Service Routine before re-enabling
this interrupt. The Timer0 interrupt cannot wake the
processor from Sleep since the timer is shut off during
Sleep.
FIGURE 5-1:
BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER
Note:
Additional information on the Timer0
module is available in the “PICmicro®
Mid-Range
MCU
Family
Reference
Manual” (DS33023).
Note:
Counter mode has specific external clock
requirements. Additional information on
these requirements is available in the
”PICmicro®
Mid-Range
MCU
Family
Reference Manual (DS33023).
T0CKI
T0SE
pin
CLKOUT
TMR0
Watchdog
Timer
WDT
Time-out
PS<2:0>
WDTE
Data Bus
Set Flag bit T0IF
on Overflow
T0CS
Note
1: T0SE, T0CS, PSA and PS<2:0> are bits in the Option register, WDTPS<3:0> are bits in the WDTCON register.
0
1
0
1
0
1
SYNC 2
Cycles
8
8
8-bit
Prescaler
0
1
(= FOSC/4)
PSA
PSA
PSA
16-bit
Prescaler
16
WDTPS<3:0>
31 kHz
INTRC
SWDTEN


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