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68HC705BD7 Datasheet(PDF) 73 Page - Freescale Semiconductor, Inc

Part # 68HC705BD7
Description  SPECIFICATION REV 2.0 (General Release)
PDF  85 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

68HC705BD7 Datasheet(HTML) 73 Page - Freescale Semiconductor, Inc

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SECTION 12: A/D CONVERTER
Page 63
MC68HC05BD7 Rev. 2.0
GENERAL RELEASE SPECIFICATION
12.4
Program Example
The following example shows how to convert analog input channel 0 by using binary search
method. This approach method will guarantee any conversion can be done within 6
iterations, 98us at 2MHz bus clock. For ADCIN1 conversion, change #$00 to #$01. ADCCR
is the ADC Channel Register.
CR2
EQU
$0B
; Configuration Register
ADCCR
EQU
$15
; ADC Channel Register
ADCSR
EQU
$14
; ADC Control & Status Register
ADCDATA EQU
$50
; RAM byte to store the conversion result
REFH
EQU
$51
; RAM byte to store the high end of conversion
REFL
EQU
$52
; RAM byte to store the low end of conversion
ORG
$1000
LDA
#$3C
STA
CR2
; Configure PC2-PC5 as ADC inputs
LDA
#$00
STA
ADCCR
; Select the input channel
LDA
#$00
STA
REFL
; initial low end = #$00
LDA
#$3F
STA
REFH
; initial high end =#$3F
DALP
LDA
REFH
ADD
REFL
LSRA
; A= (REFH + REFL)/2
STA
ADCSR
; Store the comparison data to D/A
CMP
REFL
; Compare the stored value with REFL
BEQ
DONE
; If equal, the A is the result digital value
BRSET
7,ADCSR,SETHI
; Check the RESULT flag
STA
REFL
; If lower, set A as the low end of conversion
BRA
DALP
SETHI
STA
REFH
; If higher, set A as the high end of conversion
BRA
DALP
DONE
STA
ADCDATA
* Input voltage calculation at VDD=5V:
ADCDATA x 0.078125V
≤ INPUT ≤ (ADCDATA+1) x 0.078125V
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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