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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(guó))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(yè)數(shù)： | 10/12頁(yè) |
| 文件大小： | 283K |
| 代理商： | AN1775 |
Application Note
AN1775 Rev. 1
Code Listings
* ----------------------------------------------------------------------------------
* EXPANDIO.ASM
* Written for the MC68HC705P6A microcontroller
* A code segment example to illustrate the use of the A/D
* converter for key input arbitration
*
* This simple example polls the AD0 channel, compares the
* conversion result to a lookup table, and determines
* which of 8 keys were pressed.
* ----------------------------------------------------------------------------------
; Memory map equates
RAMSPACE
ROMSPACE
EQU
EQU
$50
$100
; A/D Registers
ADC
ADSC
EQU
EQU
$1D
$1E
;A/D Data register
;A/D Status and control
; ADSC Bits
CC
ADRC
ADON
EQU
EQU
EQU
7
6
5
;Conversion complete flag
;A/D RC oscillator enable
;A/D enable bit
* ----------------------------------------------------------------------------------
; RAM Variables
* ----------------------------------------------------------------------------------
ORG
RAMSPACE
InKey
RMB
1
ADValue
RMB
1
;Start of user RAM
;Identifies the last key pressed
;Stores the last ADC result
* ----------------------------------------------------------------------------------
; Program code
; Simply loops, polling the A/D converter channel AD0
; and determining which key was pressed
* ----------------------------------------------------------------------------------
ORG
ROMSPACE
Start:
LDA
#$20
STA
ADSC
;Start of user ROM
;Turn on A/D, select AD0 channel
MainLoop:
BRCLR
LDA
STA
CLR
CLRX
CC,ADSC,*
ADC
ADValue
InKey
;Wait for conversion complete
;Get the result
;Record the result
;Clear the InKey variable
;Clear the offset
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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