
1-50
HARDWARE
4506 Group User’s Manual
Fig. 49 Analog input external circuit example-1
Fig. 50 Analog input external circuit example-2
Notes for the use of A-D conversion 2
Do not change the operating mode (both A-D conversion mode
and comparator mode) of A-D converter with the bit 3 of register
Q1 while the A-D converter is operating.
When the operating mode of A-D converter is changed from the
comparator mode to A-D conversion mode with the bit 3 of regis-
ter Q1, note the following;
Clear the bit 2 of register V2 to “0” (refer to Figure 48) to
change the operating mode of the A-D converter from the com-
parator mode to A-D conversion mode with the bit 3 of register
Q1.
The A-D conversion completion flag (ADF) may be set when the
operating mode of the A-D converter is changed from the com-
parator mode to the A-D conversion mode. Accordingly, set a
value to the bit 3 of register Q1, and execute the SNZAD instruc-
tion to clear the ADF flag.
LA
8
; (02)
TV2A
; The SNZAD instruction is valid ........
LA
0
; (02)
TQ1A
; Operation mode of A-D converter is
changed from comparator mode to A-D
conversion mode.
SNZAD
NOP
: this bit is not related to change the operation
mode of A-D converter.
Fig. 48 A-D conversion interrupt program example
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20
Sensor
AIN
About 1k
Sensor
AIN
Apply the voltage withiin the specifications
to an analog input pin.
Notes for the use of A-D conversion 3
Each analog input pin is equipped with a capacitor which is used
to compare the analog voltage. Accordingly, when the analog
voltage is input from the circuit with high-impedance and, charge/
discharge noise is generated and the sufficient A-D accuracy
may not be obtained. Therefore, reduce the impedance or, con-
nect a capacitor (0.01
F to 1 F) to analog input pins (Figure
49).
When the overvoltage applied to the A-D conversion circuit may
occur, connect an external circuit in order to keep the voltage
within the rated range as shown the Figure 50. In addition, test
the application products sufficiently.
LIST OF PRECAUTIONS
Electric Characteristic Differences Between Mask ROM and One
Time PROM Version MCU
There are differences in electric characteristics, operation margin,
noise immunity, and noise radiation between Mask ROM and One
Time PROM version MCUs due to the difference in the manufac-
turing processes.
When manufacturing an application system with the One time
PROM version and then switching to use of the Mask ROM ver-
sion, please perform sufficient evaluations for the commercial
samples of the Mask ROM version.
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