ML620Q503/Q504 User's Manual
Chapter 6 Clock Generation Circuit
FEUL620Q504
6–23
6.3.2.6 High-Speed External Clock Mode Operation
For the high-speed external clock, the oscillation start/stop can be controlled by the frequency control register1
(FCON1).
Oscillation can be started by setting the ENOSC bit of FCON1 to "1". The external clock starts to be supplied as
OSCLK after the built-in RC oscillation clock is counted to 512 after the oscillation starts and then the external
clock is counted to 128. The high-speed clock generation circuit stops oscillation when it shifts to the STOP
mode by software. By releasing the stop mode by an external interrupt, the low-speed built-in RC oscillation
clock is counted to 29 and then the high-speed built-in RC oscillation clock is counted to 512, then the built-in
RC oscillation clock is supplied as OSCLK. And OSCLK changes from RC oscillation into external clock by the
automatic operation in case of 128 counts by the external clock.
Refer to Chapter 4 “Power Management” for the operation at each power down mode.
Figure 6-14 shows the operation waveforms of the high-speed clock generation circuit in the external clock input
mode.
ENOSC bit
External interrupt occurred
OSCLK switch
OSCLK
High-speed oscillation
128 counts
RC oscillation
STOP
mode
built-in RC oscillation
RC oscillation
High-speed
built-in RC oscillation
High-speed
External clock
HOSCS bit
RC oscillation 512 counts
Low-speed oscillation
built-in oscillation
Low-speed RC oscillation 29 counts
OSCM=”11”
External clock
External clock
built-in oscillation
High-speed oscillation
128 counts
built-in RC oscillation
RC oscillation 512 counts
OSCLK switch
(a) In the low-speed built-in RC oscillation mode
External clock
External clock
Содержание LAPIS SEMICONDUCTOR ML620Q503
Страница 2: ...ML620Q503 Q504 User s Manual Issue Date Apr 16 2015 FEUL620Q504 01...
Страница 18: ...Chapter 1 Overview...
Страница 32: ...Chapter 2 CPU and Memory Space...
Страница 44: ...Chapter 3 Reset Function...
Страница 50: ...Chapter 4 Power Management...
Страница 70: ...Chapter 5 Interrupts...
Страница 134: ...Chapter 6 Clock Generation Circuit...
Страница 161: ...Chapter 7 Time Base Counter...
Страница 170: ...Chapter 8 Timers...
Страница 183: ...Chapter 9 Function Timer FTM...
Страница 231: ...Chapter 10 Watchdog Timer...
Страница 239: ...Chapter 11 Synchronous Serial Port SSIO...
Страница 251: ...Chapter 12 Synchronous Serial Port with FIFO SSIOF...
Страница 283: ...Chapter 13 UART...
Страница 303: ...Chapter 14 UART with FIFO UARTF...
Страница 327: ...Chapter 15 I2 C Bus Interface...
Страница 344: ...Chapter 16 Port XT...
Страница 350: ...Chapter 17 Port 0...
Страница 361: ...Chapter 18 Port 1...
Страница 368: ...Chapter 19 Port2...
Страница 379: ...Chapter 20 Port 3...
Страница 395: ...Chapter 21 Port 4...
Страница 410: ...Chapter 22 Port 5...
Страница 426: ...Chapter 23 Melody Driver...
Страница 439: ...Chapter 24 RC Oscillation type A D Converter RC ADC...
Страница 462: ...Chapter 25 Successive Approximation Type A D Converter SA ADC...
Страница 479: ...Chapter 26 Analog Comparator...
Страница 489: ...Chapter 27 Flash Memory Control...
Страница 505: ...Chapter 28 Voltage Level Supervisor VLS...
Страница 517: ...Chapter 29 LLD circuit...
Страница 519: ...Chapter 30 On Chip Debug Function...
Страница 522: ...Appendixes...
Страница 552: ...Revision History...