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参数资料
| 型号： | PIC12F635T-E/SN |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, MS-012, SOIC-8 |
| 文件页数： | 28/196页 |
| 文件大小： | 3291K |
| 代理商： | PIC12F635T-E/SN |
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2005 Microchip Technology Inc.
Preliminary
DS41232B-page 121
PIC12F635/PIC16F636/639
12.9
Interrupts
The PIC12F635/PIC16F636/639 has 8 sources of
interrupt:
External Interrupt RA2/INT
Timer0 Overflow Interrupt
PORTA Change Interrupts
2 Comparator Interrupts
Timer1 Overflow Interrupt
EEPROM Data Write Interrupt
Fail-Safe Clock Monitor Interrupt
The Interrupt Control register (INTCON) and Peripheral
Interrupt Request Register 1 (PIR1) record individual
interrupt requests in flag bits. The INTCON register
also has individual and global interrupt enable bits.
A Global Interrupt Enable bit, GIE (INTCON<7>),
enables (if set) all unmasked interrupts, or disables (if
cleared) all interrupts. Individual interrupts can be
disabled through their corresponding enable bits in the
INTCON register and PIE1 register. GIE is cleared on
Reset.
The Return from Interrupt instruction, RETFIE, exits
the interrupt routine, as well as sets the GIE bit, which
re-enables unmasked interrupts.
The following interrupt flags are contained in the
INTCON register:
INT Pin Interrupt
PORTA Change Interrupt
TMR0 Overflow Interrupt
The peripheral interrupt flags are contained in the
special register, PIR1. The corresponding interrupt
enable bit is contained in special register, PIE1.
The following interrupt flags are contained in the PIR1
register:
EEPROM Data Write Interrupt
2 Comparator Interrupts
Timer1 Overflow Interrupt
Fail-Safe Clock Monitor Interrupt
When an interrupt is serviced:
The GIE is cleared to disable any further interrupt.
The return address is pushed onto the stack.
The PC is loaded with 0004h.
For external interrupt events, such as the INT pin or
PORTA change interrupt, the interrupt latency will be
three or four instruction cycles. The exact latency
depends upon when the interrupt event occurs (see
Figure 12-8). The latency is the same for one or two-
cycle instructions. Once in the Interrupt Service
Routine, the source(s) of the interrupt can be
determined by polling the interrupt flag bits. The
interrupt flag bit(s) must be cleared in software before
re-enabling interrupts to avoid multiple interrupt
requests.
For additional information on Timer1, comparators or
data EEPROM modules, refer to the respective
peripheral section.
12.9.1
RA2/INT INTERRUPT
External interrupt on RA2/INT pin is edge-triggered;
either rising if the INTEDG bit (OPTION<6>) is set, or
falling if the INTEDG bit is clear. When a valid edge
appears on the RA2/INT pin, the INTF bit (INTCON<1>)
is set. This interrupt can be disabled by clearing the
INTE control bit (INTCON<4>). The INTF bit must be
cleared in software in the Interrupt Service Routine
before re-enabling this interrupt. The RA2/INT interrupt
can wake-up the processor from Sleep if the INTE bit
was set prior to going into Sleep. The status of the GIE
bit decides whether or not the processor branches to the
interrupt
vector
following
wake-up
(0004h).
See
Section 12.12 “Power-Down Mode (Sleep)” for details
on Sleep and Figure 12-10 for timing of wake-up from
Sleep through RA2/INT interrupt.
Note 1: Individual interrupt flag bits are set,
regardless
of
the
status
of
their
corresponding mask bit or the GIE bit.
2: When an instruction that clears the GIE
bit is executed, any interrupts that were
pending for execution in the next cycle
are ignored. The interrupts, which were
ignored, are still pending to be serviced
when the GIE bit is set again.
Note:
The CMCON0 (19h) register must be
initialized to configure an analog channel
as a digital input. Pins configured as
analog inputs will read ‘0’.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC12F635TI/MF | 制造商:MICROCHIP 制造商全称: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 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC12F635TI/MFQTP | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:8/14-PIN FLASH-BASED, 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY |
| PIC12F635TI/P | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:8/14-PIN FLASH-BASED, 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY |
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