ML620Q503/Q504 User's Manual
Chapter 6 Clock Generation Circuit
FEUL620Q504
6–12
6.3 Description of Operation
6.3.1 Low-Speed Clock
6.3.1.1
Low-Speed Built-In RC Oscillation Mode
Figure 6-3 shows the low-speed clock generation circuit configuration in the built-in RC oscillation mode.
When the RC oscillation clock is counted to 128, the low-speed oscillation clock (LSCLK) starts to be supplied.
Figure 6-3 Circuit Configuration in the low-speed Built-in RC Oscillation Mode
6.3.1.2
Low-Speed Crystal Oscillation Mode
Figure 6-4 shows the low-speed clock generation circuit configuration in the crystal oscillation mode.
The low-speed clock generation circuit is provided with an external 32.768 kHz crystal. To match the oscillation
frequency by using a trimmer capacitor, connect external capacitors (C
GL
and C
DL
) as required.
Figure 6-4 Circuit Configuration of the Crystal Oscillation Mode
[Note]
•Install the crystal oscillator near LSI as much as possible, and do not place a signal and power supply wiring
that it becomes a noise source near the crystal oscillator and the wiring.
•The impedance between XT1 and XT0 might decrease by moisture uptake of circuit board in high moisture
environment and condensation on the circuit board, and then the oscillation trouble may occur. Please make
moisture measures such as coating the circuit board when used in such environments. The oscillation stop
might be caused due to condensation.
STOP mode
LSCLK(low-speed oscillation clock)
V
DDL
RC oscillator
circuits
128 counts
PXT0
V
SS
C
DL
C
GL
32.768kHz
Crystal oscillator
PXT1
V
DDL
STOP mode
Low-speed
clock (LSCLK)
R
F
Control circuits
8192 counts
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...