PIC12F683-E/P Microchip Technology Inc., PIC12F683-E/P Datasheet - Page 44

• Manufacturer Part Number: PIC12F683-E/P
• Description: 8 PIN, 3.5 KB FLASH, 128 RAM, 6 I/O, PDIP
• Manufacturer: Microchip Technology Inc.

Specifications of PIC12F683-E/P

• A/d Inputs: 4 Channel, 10-Bit
• Comparators: 1
• Cpu Speed: 5 MIPS
• Eeprom Memory: 256 Bytes
• Frequency: 20 MHz
• Input Output: 6
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 8-pin PDIP
• Programmable Memory: 3.5K Bytes
• Ram Size: 128 Bytes
• Serial Interface: None
• Speed: 20 MHz
• Timers: 2-8-bit, 1-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC12F683
6.1
Timer1 can operate in one of three modes:
• 16-bit timer with prescaler
• 16-bit synchronous counter
• 16-bit asynchronous counter
In Timer mode, Timer1 is incremented on every
instruction cycle. In Counter mode, Timer1 is
incremented on the rising edge of the external clock
input T1CKI. In addition, the Counter mode clock can
be synchronized to the microcontroller system clock or
run asynchronously.
In Counter and Timer modules, the counter/timer clock
can be gated by the Timer 1 gate, which can be
selected as either the T1G pin or the comparator
output.
If an external clock oscillator is needed (and the
microcontroller is using the INTOSC w/o CLKOUT),
Timer1 can use the LP oscillator as a clock source.
6.2
The Timer1 register pair (TMR1H:TMR1L) increments
to FFFFh and rolls over to 0000h. When Timer1 rolls
over, the Timer1 interrupt flag bit (PIR1<0>) is set. To
enable the interrupt on rollover, you must set these bits:
• Timer1 interrupt enable bit (PIE1<0>)
• PEIE bit (INTCON<6>)
• GIE bit (INTCON<7>).
The interrupt is cleared by clearing the TMR1IF bit in
the Interrupt Service Routine.
FIGURE 6-2:
DS41211B-page 42
Note:
Note:
T1CKI = 1
when TMR1
Enabled
T1CKI = 0
when TMR1
Enabled
Note 1:
Timer1 Modes of Operation
Timer1 Interrupt
2:
In Counter mode, a falling edge must be
registered by the counter prior to the first
incrementing rising edge.
The TMR1H:TTMR1L register pair and the
TMR1IF bit should be cleared before
enabling interrupts.
Arrows indicate counter increments.
In Counter mode, a falling edge must be registered by the counter prior to the first incrementing rising edge of the
clock.
TIMER1 INCREMENTING EDGE
Preliminary
6.3
Timer1 has four prescaler options allowing 1, 2, 4 or 8
divisions of the clock input. The T1CKPS bits
(T1CON<5:4>) control the prescale counter. The
prescale counter is not directly readable or writable;
however, the prescaler counter is cleared upon a write
to TMR1H or TMR1L.
6.4
Timer1 gate source is software configurable to be the
T1G pin or the output of the comparator. This allows the
device to directly time external events using T1G or
analog events using the comparator. See CMCON1
(Register 8-2) for selecting the Timer1 gate source.
This feature can simplify the software for a Delta-Sigma
A/D converter and many other applications. For more
information on Delta-Sigma A/D Converters, see the
Microchip web site (www.microchip.com).
Timer1 gate can be inverted by using the T1GINV bit
(T1CON<7>), whether it originates from the T1G pin or
the comparator output. This configures Timer1 to
measure either the active-high or active-low time
between events.
Note:
Timer1 Prescaler
Timer1 Gate
TMR1GE bit (T1CON<6>) must be set to
use either T1G or COUT as the Timer1
gate source. See Register 8-2 for more
information on selecting the Timer1 gate
source.
 2004 Microchip Technology Inc.