
ML62Q1000 Series User's Manual
Chapter 6
Clock Generation Circuit
FEUL62Q1000
6-17
6.3.1.2
Configuration of Low-Speed Crystal Oscillation Circuit
Figure 6-5 shows the configuration of the low-speed crystal oscillation circuit.
This circuit is unavailable on the ML62Q1300 group.
The 32.768 kHz crystal oscillator can be chosen in the low-speed clock mode register (FLMOD).
When choosing the low-speed crystal oscillation clock for the low-speed clock, the port forcibly becomes Hi-Z output.
When choosing an external low-speed crystal oscillation circuit for the low-speed clock, the backup function is activated.
The backup function is the function that always monitors the low-speed crystal oscillation. If an oscillation stop is
detected, it switches the low-speed clock to the low-speed RC oscillation clock.
The low-speed crystal oscillation circuit stops its operation if entering the STOP/STOP-D mode.
The state on the LSI transfers to the backup mode in the following three cases:
- The low-speed crystal oscillation circuit is chosen for the low-speed clock through the FLMOD register.
- The STOP/STOP-D mode has been released.
- The low-speed crystal oscillation clock stops for 8 ms.
Figure 6-5 Circuit Configuration of Low-speed Crystal Oscillation Mode
[Note]
Ÿ
Place the crystal resonator as close to the LSI as possible and make sure that signals causing noise and
power supply wiring are not near the crystal and its wiring.
Ÿ
Note that oscillation may stop due to condensation.
Ÿ
When switching to the low speed crystal oscillation clock, ensure to use the interrupt referring to the
Section 6.3.5
"
Switching the Low-speed Clock
"
.
Ÿ
When using the low-speed crystal oscillation clock and choosing the high-speed clock for the system
clock, switch the system clock to the high-speed clock before entering the STOP/STOP-D mode.
XT0
V
SS
C
DL
C
GL
32.768 kHz
crystal resonator
XT1
Low-speed
clock LSCLK
Control circuit
Low-speed crystal
oscillation
FLMOD (SFR)
STOP mode
Low-speed RC
oscillation clock
Code option
Summary of Contents for ML62Q1000 Series
Page 17: ...Chapter 1 Overview...
Page 112: ...Chapter 2 CPU and Memory Space...
Page 154: ...Chapter 3 Reset Function...
Page 166: ...Chapter 4 Power Management...
Page 196: ...Chapter 5 Interrupts...
Page 248: ...Chapter 6 Clock generation Circuit...
Page 274: ...Chapter 7 Low Speed Time Base Counter...
Page 291: ...Chapter 8 16 Bit Timer...
Page 320: ...Chapter 9 Functional Timer FTM...
Page 382: ...Chapter 10 Watchdog Timer...
Page 402: ...Chapter 11 Serial Communication Unit...
Page 456: ...Chapter 12 I2 C Bus Unit...
Page 491: ...Chapter 13 I2 C Master...
Page 512: ...Chapter 14 DMA Controller...
Page 531: ...Chapter 15 Buzzer...
Page 550: ...Chapter 16 Simplified RTC...
Page 559: ...Chapter 17 GPIO...
Page 594: ...Chapter 18 External Interrupt Function...
Page 612: ...Chapter 19 CRC Generator...
Page 632: ...Chapter 20 Analog Comparator...
Page 644: ...Chapter 21 D A Converter...
Page 655: ...Chapter 22 Voltage Level Supervisor...
Page 676: ...Chapter 23 Successive Approximation Type A D Converter...
Page 709: ...Chapter 24 Regulator...
Page 714: ...Chapter 25 Flash Memory...
Page 743: ...Chapter 26 Code Option...
Page 750: ...Chapter 27 LCD Driver...
Page 788: ...Chapter 28 On Chip Debug Function...
Page 795: ...Chapter 29 Safety Function...
Page 813: ...Appendix A...
Page 881: ...Revision History...