參數(shù)資料
型號： DRM045
英文描述： Using the ASB520 MC68HC908QT2 Based Infrared Remote Control Reference PC Board Designer Reference Manual
中文描述： 使用ASB520 MC68HC908QT2的紅外遙控器參考PC板設計參考手冊
文件頁數(shù)： 53/80頁
文件大小： 1025K
代理商： DRM045
Software
Software Routines
DRM040 — Rev 0
Designer Reference Manual
MOTOROLA
Software
53
3.1.15 Keyboard ISR
The keyboard interrupt ISR is very simple. It is entered immediately a
key is pressed. The key that initiated the interrupt is decoded and the
appropriate flag is set in the ApplicationFlags buffer. The interrupt is also
disabled to prevent the ISR being re-entered immediately after the ISR
is exited. This is a possibility as the input could still be logic low after the
interrupt has been serviced. The interrupts are enabled in the switch
decode function.
Figure 3-15
shows the KBD_ISR flow diagram.
Figure 3-15. Keyboard Interrupt
KBD_ISR
Get source of Interrupt and set
flag in ApplicationFlags. Only
interested in upper 2 bits
DISPLAY_KEY
Pressed (Bit6)
Y
Return
N
Disable Display Key Interrupt
TAMPER_KEY Pressed
(Bit7)
Disable Tamper key Interrupt
Clear Keyboard Interrupt flag
N
Y
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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