4524_M Datasheet, PDF (216/310 Pages) Renesas Technology Corp – 4-BIT CISC SINGLE-CHIP MICROCOMPUTER 720 FAMILY / 4500 SERIES

4524 Group
APPLICATION
2.4 A/D converter
(3) A/D control register Q2
Table 2.4.3 shows the A/D control register Q2.
Set the contents of this register through register A with the TQ2A instruction.
The contents of register Q2 is transferred to register A with the TAQ2 instruction.
Table 2.4.3 A/D control register Q2
AD control register Q2
at reset : 00002 at power down : state retained
0 P23
Q23 P23/AIN3 pin function selection bit
1
AIN3
0 P22
Q22 P22/AIN2 pin function selection bit
1
AIN2
0 P21
Q21 P21/AIN1 pin function selection bit
1
AIN1
0 P20
Q20 P20/AIN0 pin function selection bit
1
AIN0
Notes 1: “R” represents read enabled, and “W” represents write enabled.
2: In order to select AIN3–AIN0, set register Q1 after setting regsiter Q2.
R/W
(4) A/D control register Q3
Table 2.4.4 shows the A/D control register Q3.
Set the contents of this register through register A with the TQ3A instruction.
The contents of register Q3 is transferred to register A with the TAQ3 instruction.
Table 2.4.4 A/D control register Q3
AD control register Q3
at reset : 00002 at power down : state retained
0 P33
Q33 P33/AIN7 pin function selection bit
1
AIN7
0 P32
Q32 P32/AIN6 pin function selection bit
1
AIN6
0 P31
Q31 P31/AIN5 pin function selection bit
1
AIN5
0 P30
Q30 P30/AIN4 pin function selection bit
1
AIN4
Notes 1: “R” represents read enabled, and “W” represents write enabled.
2: In order to select AIN7–AIN4, set register Q1 after setting regsiter Q3.
R/W
2.4.2 A/D converter application examples
(1) A/D conversion mode
Outline: Analog input signal from a sensor can be converted into digital values.
Specifications: Analog voltage values from a sensor is converted into digital values by using a 10-
bit successive comparison method. Use the AIN0 pin for this analog input.
Figure 2.4.2 shows the A/D conversion mode setting example.
Rev.2.00 Aug, 06 2004
REJ09B0107-0200Z
2-52