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參數(shù)資料
| 型號(hào)： | PIC12F635T-E/SN |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, MS-012, SOIC-8 |
| 文件頁(yè)數(shù)： | 154/196頁(yè) |
| 文件大小： | 3291K |
| 代理商： | PIC12F635T-E/SN |
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PIC12F635/PIC16F636/639
DS41232B-page 58
Preliminary
2005 Microchip Technology Inc.
6.1
Timer1 Modes of Operation
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 Timer1 gate, which can be selected
as either the T1G pin or the Comparator 2 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
Timer1 Interrupt
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.
6.3
Timer1 Prescaler
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
Timer1 gate source is software configurable to be the
T1G pin or the output of Comparator 2. This allows the
device to directly time external events using T1G or
analog events using Comparator 2. See CMCON1
(Register 7-2) for selecting the Timer1 gate source.
This feature can simplify the software for many other
applications.
Timer1 gate can be inverted using the T1GINV bit
(T1CON<7>), whether it originates from the T1G pin or
Comparator 2 output. This configures Timer1 to
measure either the active-high or active-low time
between events.
FIGURE 6-2:
TIMER1 INCREMENTING EDGE
Note:
In Counter mode, a falling edge must be
registered by the counter prior to the first
incrementing rising edge.
Note:
The TMR1H:TTMR1L register pair and the
TMR1IF bit should be cleared before
enabling interrupts.
Note:
TMR1GE bit (T1CON<6>) must be set to
use either T1G or C2OUT as the Timer1
gate source. See Register 7-2 for more
information on selecting the Timer1 gate
source.
T1CKI = 1
when TMR1
Enabled
T1CKI = 0
when TMR1
Enabled
Note 1:
Arrows indicate counter increments.
2:
In Counter mode, a falling edge must be registered by the counter prior to the first incrementing rising edge of
the clock.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PIC12F635T-I/MD | 功能描述:8位微控制器 -MCU 2 KB 64 RAM 6I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC12F635TI/MF | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8/14-PIN FLASH-BASED, 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY |
| PIC12F635T-I/MF | 功能描述:8位微控制器 -MCU 2kb 64 RAM 6 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC12F635TI/MFQTP | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8/14-PIN FLASH-BASED, 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY |
| PIC12F635TI/P | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8/14-PIN FLASH-BASED, 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY |
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