參數(shù)資料
型號: MC68HC05T16B
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP56
封裝: PLASTIC, SDIP-56
文件頁數(shù): 119/128頁
文件大?。?/td> 734K
代理商: MC68HC05T16B
MOTOROLA
10-2
MC68HC05T16
ANALOG TO DIGITAL CONVERTER
10
10.1
ADC Inputs
The ADC has two input channels: one dedicated input pin at ADCIN0 and one shared pin at
PF4/ADCIN1.
10.1.1
PF4/ADCIN1
ADCIN1 multiplexes with PF4 at this pin. When the ADC1 bit of Port F Conguration register is
cleared, PF4/ADCIN1 is congured for PF4 and follows Port F DDR assignment. When ADC1 bit
is set, PF4 is congured as ADCIN1 analog input, and Port F DDR has no effect on this pin.
Reading PF4 when congured as an ADC input is zero.
10.1.2
ADCIN0
ADCIN0 is a dedicated analog input channel.
10.2
Program Example
The following example shows how to convert analog input channel 0 (ADCIN0). For ADCIN1
conversion, change #$00 to #$20. ADCSR is the ADC Control/Status register.
LDA
#$00
STA
ADCSR
;ADC Control and Status Register
DTA
BRSET
7, ADCSR, ATD
INC
ADCSR
LDA
ADCSR
AND
#$1F
CMP
#$1F
BLS
DTA
;out of range
ATD
...
;analog value in ADC.
;ANALOG IN = ([AD4:0] +1)*0.15625V at Vdd = 5V
TPG
88
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