參數(shù)資料
型號(hào)： MC68HRC705KJ1CDW
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDSO16
封裝： SOIC-16
文件頁數(shù)： 67/117頁
文件大?。?/td> 1644K
代理商： MC68HRC705KJ1CDW
MC68HC705KJ1MC68HRC705KJ1MC68HLC705KJ1 — Rev. 4.0
Data Sheet
MOTOROLA
External Interrupt Module (IRQ)
53
Data Sheet — MC68HC705KJ1
Section 5. External Interrupt Module (IRQ)
The external interrupt (IRQ) module provides asynchronous external interrupts to
the CPU. The following sources can generate external interrupts:
IRQ/VPP pin
PA0–PA3 pins
5.2 Features
The external interrupt module (IRQ) includes these features:
Dedicated external interrupt pin (IRQ/VPP)
Selectable interrupt on four input/output (I/O) pins (PA0–PA3)
Programmable edge-only or edge- and level-interrupt sensitivity
5.3 Operation
The interrupt request/programming voltage pin (IRQ/VPP) and port A pins 0–3
(PA0–PA3) provide external interrupts. The PIRQ bit in the mask option register
(MOR) enables PA0–PA3 as IRQ interrupt sources, which are combined into a
single OR’ing function to be latched by the IRQ latch. Figure 5-1 shows the
structure of the IRQ module.
After completing its current instruction, the CPU tests the IRQ latch. If the IRQ latch
is set, the CPU then tests the I bit in the condition code register and the IRQE bit
in the IRQ status and control register. If the I bit is clear and the IRQE bit is set, the
CPU then begins the interrupt sequence. This interrupt is serviced by the interrupt
service routine located at $07FA and $07FB.
The CPU clears the IRQ latch while it fetches the interrupt vector, so that another
external interrupt request can be latched during the interrupt service routine. As
soon as the I bit is cleared during the return from interrupt, the CPU can recognize
the new interrupt request. Figure 5-3 shows the sequence of events caused by an
interrupt.
相關(guān)PDF資料
PDF描述
MC68HRC705KJ1CS 8-BIT, UVPROM, 4 MHz, MICROCONTROLLER, CDIP16
MC68HRC705KJ1CP 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDIP16
MC68HLC705KJ1CDW 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDSO16
MC68HC705KJ1CP 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDIP16
MC68HLC705KJ1CP 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDIP16
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