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3850 Group (Spec. H) User’s Manual
APPLICATION
2.6 A-D converter
2.6.3 A-D converter application examples
(1)
Conversion of analog input voltage
Outline : The analog input voltage input from a sensor is converted to digital values.
Figure 2.6.7 shows a connection diagram, and Figure 2.6.8 shows the relevant registers setting.
Fig. 2.6.7 Connection diagram
Specifications : The analog input voltage input from a sensor is converted to digital values.
P30/AN0 pin is used as an analog input pin.
Fig. 2.6.8 Relevant registers setting
P30/AN0
3850 Group
Sensor
A-D control register (address 3416)
ADCON
0
Analog input pin : P30/AN0 selected
A-D conversion start
0
b0
b7
A-D conversion register (high-order); (address 3616)
ADH
ADL
b0
b7
b0
b7
(Read-only)
A-D conversion register (low-order); (address 3516)
(Read-only)
A result of A-D conversion is stored (Note).
Note: After bit 4 of ADCON is set to “1”, read out that contents.
When reading 10-bit data, read address 003616 before address 003516;
when reading 8-bit data, read address 003516 only.