參數(shù)資料
型號: MC68HSC705J1ACDWR2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封裝: SOIC-20
文件頁數(shù): 3/162頁
文件大?。?/td> 1517K
代理商: MC68HSC705J1ACDWR2
Technical Data
MC68HC705J1A — Rev. 3.0
100
External Interrupt Module (IRQ)
MOTOROLA
External Interrupt Module (IRQ)
8.3 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 ORing function to be latched by the
IRQ latch. Figure 8-1 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 8-2
shows the sequence of events caused by an interrupt.
Figure 8-1. IRQ Module Block Diagram
PIRQ
LEVEL-SENSITIVE TRIGGER
PA3
PA2
PA1
IRQ
PA0
VDD
(MOR LEVEL BIT)
RESET
IRQ VECTOR FETCH
EXTERNAL
INTERRUPT
REQUEST
(MOR)
TO BIH & BIL
INSTRUCTION
PROCESSING
IRQF
IRQR
IRQE
DQ
CK
IRQ
CLR
LATCH
相關(guān)PDF資料
PDF描述
MC68HRC705J1ADWR2 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO20
MC68HSR705J1ACDWR2 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO20
MC68HC705J1ADWR2 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO20
MC68HC705J1ADWR2 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO20
MC68HSR705J1ADWR2 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO20
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