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參數(shù)資料
| 型號(hào)： | AN1775 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Expanding Digital Input with an A/D Converter |
| 中文描述： | 擴(kuò)展數(shù)字輸入與A / D轉(zhuǎn)換器 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 283K |
| 代理商： | AN1775 |
Application Note
Code Listings
AN1775 Rev. 1
;Check the entries in the table, to find the ADC value range
;that corresponds to the ADC data register value.
KeyLoop:
LDA
KeyTable+1,X
CMP
ADValue
BLS
Match
LDA
KeyTable,X
CMP
ADVAlue
BLS
Match
INCX
INCX
;Increment the key value, when a match is made,
;the variable will contain the key that was pressed.
INC
InKey
BRA
KeyLoop
;Check high range
;Within range
;Check low range
;Within range
;Point to next table record
; At this point, InKey variable holds keypress information
; One can arbitrate the key press here. For this simple example
; we just repeat the main loop
Match:
BRA
MainLoop
* ----------------------------------------------------------------------------------
; Key lookup table. Holds the minimum and maximum ADC values
; which identify a particular key in the resistor ladder
* ----------------------------------------------------------------------------------
KeyTable:
NoKey
FCB
$EF,$FF
Key1
FCB
$00,$0F
Key2
FCB
$0F,$2F
Key3
FCB
$2F,$4F
Key4
FCB
$4F,$6F
Key5
FCB
$6F,$8F
Key6
FCB
$8F,$AF
Key7
FCB
$AF,$CF
Key8
FCB
$CF,$EF
;No key pressed
* ----------------------------------------------------------------------------------
; Vector definitions
* ----------------------------------------------------------------------------------
ORG
$1FFE
FDB
Start
;Reset vector
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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