参数资料
型号: MC68HC05P9AVDW
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: SOIC-28
文件页数: 109/158页
文件大小: 3885K
代理商: MC68HC05P9AVDW
Resets and Interrupts
54
Resets and Interrupts
Figure 20. External Interrupt Logic
Setting the I bit in the condition code register disables external interrupts.
Interrupt triggering sensitivity of the IRQ pin is a mask option. The IRQ
pin can be negative-edge triggered or negative-edge- and low-level
triggered. The level-sensitive triggering option allows multiple external
interrupt sources to be wire-ORed to the IRQ pin. An external interrupt
request, shown in Figure 21, is latched as long as any source is holding
the IRQ pin low.
Figure 21. External Interrupt Timing
EXTERNAL
INTERRUPT
REQUEST
FROM OTHER
PORT B PINS
D
C
Q
R
Q
I BIT
VDD
(FROM CCR)
RESET
EXTERNAL INTERRUPT VECTOR FETCH
IRQ
EDGE ONLY
EDGE AND LEVEL
MASK OPTION
IRQ (INTERNAL)
tILIH
tILIL
tILIH
IRQ/V
PP PIN
IRQ1
IRQn
.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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