48
8Bit Single Chip Microcontroller
DMC73C168
The A/D Converter can be controlled by the three register on the Peripheral File.
The function block diagram is shown in Figure 5-7.
8-Bit
Data Register
ADDATA
(P15)
Port A
Analog
Comparator
Temporaly
Register
A2
A3
Analog
Multiplexer
VDD
VDD
8-Bit D/A
Converter
A/D START (P14, bit 6)
Analog Input Select (P14, bit 0)
Analog Select (P13, bit 2, 3)
Figure 5-7. A/D Converter Function Block Diagram
5.6.1 A/D Converter Control / Data Registers
P15
>010F
5
ADDATA
4
7
6
3
2
1
0
R
CONVERSION DATA REGISTER
I N V A L I D
W
Note : After reset, all bits have "0"
Bit 0 - Bit 7 A/D CONVERSION DATA (0 - 255)
P14
>010E
5
ADCNTL
4
7
6
3
2
1
0
R
ANALOG
CHANNEL
SELECT
READY
START
NOT USED
W
Bit 0 : ANALOG CHANNEL SELECT
ANALOG CHANNEL SELECT is determined by the value of P14 bit 0 at the beginning
of conversion. If a new value is loaded to these bits during A/D conversion, it is effective for
next conversion cycle.
PORT
A2
BIT0
0
1
A3
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