MC68HC705T16 MOTOROLA [Motorola, Inc], MC68HC705T16 Datasheet - Page 90
MC68HC705T16
Manufacturer Part Number
MC68HC705T16
Description
High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC705T16.pdf
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10
10.1
The ADC has two input channels: one dedicated input pin at ADCIN0 and one shared pin at
PF4/ADCIN1.
10.1.1
ADCIN1 multiplexes with PF4 at this pin. When the ADC1 bit of Port F Configuration register is
cleared, PF4/ADCIN1 is configured for PF4 and follows Port F DDR assignment. When ADC1 bit
is set, PF4 is configured as ADCIN1 analog input, and Port F DDR has no effect on this pin.
Reading PF4 when configured as an ADC input is zero.
10.1.2
ADCIN0 is a dedicated analog input channel.
10.2
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.
DTA
;out of range
ATD
MOTOROLA
10-2
LDA
STA
BRSET 7, ADCSR, ATD
INC
LDA
AND
CMP
BLS
...
ADC Inputs
PF4/ADCIN1
ADCIN0
Program Example
#$00
ADCSR
ADCSR
ADCSR
#$1F
#$1F
DTA
;analog value in ADC.
;ANALOG IN = ([AD4:0] +1)*0.15625V at Vdd = 5V
ANALOG TO DIGITAL CONVERTER
;ADC Control and Status Register
MC68HC05T16
TPG
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