參數(shù)資料
型號： DRM040
英文描述： Single Phase Digital Power Meter Reference Design
中文描述： 單相電能表的數(shù)字參考設(shè)計
文件頁數(shù)： 53/80頁
文件大?。?/td> 1025K
代理商： DRM040
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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