ML620Q503/Q504 User's Manual
Chapter 24 RC Oscillation Type A/D Converter
FEUL620Q504 24-1
24 RC Oscillation Type A/D Converter (RC-ADC)
24.1 General Description
The RC oscillation type A-D Converter (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.
In addition, a different sensor for each of the two channels of RC-ADC’s RC oscillator circuit can be used to
broaden RC-ADC applications; for example, the converter can be used for expansion of measurement range or
measurement at two points.
For input clocks, see Chapter 6, "Clock Generation Circuit".
24.1.1 Features
•
2-channel system by time division
24.1.2 Configuration
The RC-ADC consists of two RC oscillator circuits to form two channels, Counter A (RADCA0 and RADCA1)
and Counter B (RADCB0 and RADCB1) as 24-bit binary counters, and an RC-ADC control circuit (RADCON,
RADMOD). Figure 24-1 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 24-1 Configuration of RC-ADC
RC
oscillation
(RCOSC0)
Data bus
P00/IN0
LSCLK
RC-ADC
Control circuits
(RADCON)
(RADMOD)
Interrupt
control
RADINT
P01/CS0
P03/RS0
P02/RCT0
P04/RT0
P20/IN1
P21/CS1
P22/RS1
P23/RT1
RC
oscillation
(RCOSC1)
24bits
binary counter
P05/RCM
24bits
binary counter
Counter A (RADCA0
and RADCA1)
Counter B (RADCB0
and RADCB1)
RCCLK
OVFA
OVFB
Clock
Control
circuits
OSCLK
BSCLK
Summary of Contents for LAPIS SEMICONDUCTOR ML620Q503
Page 2: ...ML620Q503 Q504 User s Manual Issue Date Apr 16 2015 FEUL620Q504 01...
Page 18: ...Chapter 1 Overview...
Page 32: ...Chapter 2 CPU and Memory Space...
Page 44: ...Chapter 3 Reset Function...
Page 50: ...Chapter 4 Power Management...
Page 70: ...Chapter 5 Interrupts...
Page 134: ...Chapter 6 Clock Generation Circuit...
Page 161: ...Chapter 7 Time Base Counter...
Page 170: ...Chapter 8 Timers...
Page 183: ...Chapter 9 Function Timer FTM...
Page 231: ...Chapter 10 Watchdog Timer...
Page 239: ...Chapter 11 Synchronous Serial Port SSIO...
Page 251: ...Chapter 12 Synchronous Serial Port with FIFO SSIOF...
Page 283: ...Chapter 13 UART...
Page 303: ...Chapter 14 UART with FIFO UARTF...
Page 327: ...Chapter 15 I2 C Bus Interface...
Page 344: ...Chapter 16 Port XT...
Page 350: ...Chapter 17 Port 0...
Page 361: ...Chapter 18 Port 1...
Page 368: ...Chapter 19 Port2...
Page 379: ...Chapter 20 Port 3...
Page 395: ...Chapter 21 Port 4...
Page 410: ...Chapter 22 Port 5...
Page 426: ...Chapter 23 Melody Driver...
Page 439: ...Chapter 24 RC Oscillation type A D Converter RC ADC...
Page 462: ...Chapter 25 Successive Approximation Type A D Converter SA ADC...
Page 479: ...Chapter 26 Analog Comparator...
Page 489: ...Chapter 27 Flash Memory Control...
Page 505: ...Chapter 28 Voltage Level Supervisor VLS...
Page 517: ...Chapter 29 LLD circuit...
Page 519: ...Chapter 30 On Chip Debug Function...
Page 522: ...Appendixes...
Page 552: ...Revision History...