參數(shù)資料
型號(hào)： MC68HRC705J1ACDWR2
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)： 133/162頁
文件大小： 1517K
代理商： MC68HRC705J1ACDWR2
Technical Data
MC68HC705J1A — Rev. 3.0
72
Resets and Interrupts
MOTOROLA
Resets and Interrupts
The CPU clears the IRQ latch during interrupt processing, so that
another interrupt signal on the IRQ/VPP pin can latch another interrupt
request 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 4-4 shows the IRQ/VPP pin interrupt logic.
Figure 4-4. External Interrupt Logic
Setting the I bit in the condition code register disables external interrupts.
The port A external interrupt bit (PIRQ) in the mask option register
enables pins PA0–PA3 to function as external interrupt pins.
The external interrupt sensitivity bit (LEVEL) in the mask option register
controls interrupt triggering sensitivity of external interrupt pins. The
IRQ/VPP pin can be negative-edge triggered only or negative-edge and
low-level triggered. Port A external interrupt pins can be positive-edge
triggered only or both positive-edge and high-level triggered. The
level-sensitive triggering option allows multiple external interrupt
sources to be wire-ORed to an external interrupt pin. An external
interrupt request, shown in Figure 4-5, is latched as long as any source
is holding an external interrupt pin low.
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
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