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ML610471/472/473/Q471/Q472/Q473 User's Manual
Chapter 17 RC Oscillation Type A/D Converter
17-1
17. RC Oscillation Type A/D Converter
17.1 Overview
This LSI has a built-in 1-channel RC oscillation type A/D converter (RC-ADC).
The RC-ADC converts resistance values or capacitance values to digital values by counting the oscillator clock whose
frequency changes according to the resistor or capacitor connected to the RC oscillator circuits. By using a thermistor or
humidity sensor as a resistor, a thermometer or hygrometer can be formed.
For input clocks, see Chapter 6, “Clock Generation Circuit”.
17.1.1 Features
•
1-channel system by time division
17.1.2 Configuration
The RC-ADC consists of the RC oscillator circuit to form the channel, Counter A (RADCA0 and RADCA1) and
Counter B (RADCB0 and RADCB1) as 16-bit binary counters, and an RC-ADC control circuit (RADCON, RADMOD).
Figure 17-1 shows the configuration of the RC-ADC.
RADMOD
: RC-ADC mode register
RADCON
: RC-ADC control register
RADCA0
∼
1 : RC-ADC Counter A register
RADCB0
∼
1 : RC-ADC Counter B register
Figure 17-1 Configuration of RC-ADC
Data bus
LSCLK
RC-ADC
control circuit
(RADCON)
(RADMOD)
Interrupt
control
RADINT
P44/IN1
P45/CS1
P46/RS1
P47/RT1
RC
oscillation
(RCOSC1)
16bits
binary counter
P35/RCM
16bits
binary counter
Counter A (RADCA0 and
RADCA1)
Counter B (RADCB0 and
RADCB1)
RCCLK
OVFA
OVFB
Clock
control
circuit
LSCLK×2
HSCLK
BSCLK
Summary of Contents for ML610472
Page 12: ...Chapter 1 Overview...
Page 38: ...Chapter 2 CPU and Memory Space...
Page 44: ...Chapter 3 Reset Function...
Page 48: ...Chapter 4 MCU Control Function...
Page 62: ...Chapter 5 Interrupts...
Page 82: ...Chapter 6 Clock Generation Circuit...
Page 94: ...Chapter 7 Time Base Counter...
Page 105: ...Chapter 8 Capture...
Page 114: ...Chapter 9 Timer...
Page 133: ...Chapter 10 Watchdog Timer...
Page 141: ...Chapter 11 UART...
Page 164: ...Chapter 12 Port 0...
Page 173: ...Chapter 13 Port 2...
Page 180: ...Chapter 14 Port 3...
Page 188: ...Chapter 15 Port 4...
Page 199: ...Chapter 16 Port 6...
Page 205: ...Chapter 17 RC Oscillation Type A D Converter...
Page 225: ...Chapter 18 LCD Drivers...
Page 243: ...Chapter 19 Power Supply Circuit...
Page 245: ...Chapter 20 uEASE Flash Writer System...
Page 249: ...Chapter 21 Software Development...
Page 258: ...Appendixes...
Page 280: ...Revision History...