参数资料
型号: MC68HC705J2CP
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP20
封装: PLASTIC, DIP-20
文件页数: 30/82页
文件大小: 2545K
代理商: MC68HC705J2CP
RESETS AND INTERRUPTS
5-6
Rev. 2
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Either an edge-sensitive or an edge- and level-sensitive external interrupt trigger
is programmable in the mask option register. Figure 5-4 shows the internal logic
of this programmable option.
Figure 5-4. External Interrupt Trigger Option
The edge- and level-sensitive trigger option allows multiple external interrupt
sources to be wire-ORed to the IRQ pin. With the level-sensitive trigger option, an
external interrupt request is latched as long as any source is holding the IRQ pin
low.
Setting the interrupt mask in the condition code register disables external
interrupts.
5.2.3 Software Interrupt
The software interrupt (SWI) instruction causes a nonmaskable interrupt.
VDD
D
C
Q
R
EXTERNAL
INTERRUPT
REQUEST
EXTERNAL INTERRUPT
BEING SERVICED
(VECTOR FETCH)
RESET
INTERRUPT MASK
LEVEL SENSITIVE TRIGGER
(MOR OPTION)
IRQ
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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