
ML62Q1000 Series User’s Manual
Appendix E. List of Notes
FEUL62Q1000
E-8
[ ] The pulse input to the EXTRG0 to EXTRG7 pin must have "the noise removal width chosen by
FTnTRF2 to 0 bits of FTnTRG1 re two timer clocks" or longer.
See Section 9.2.17 "FTM Common Start Register (FTCSTR)".
[ ] Writing to the bits for unequipped channels are unavailable.
See Section 9.2.18 "FTM Common Stop Register (FTCSTP)".
[ ] Set the FTnSTP bits while the FTMn is operating (FTnSTA bit of FTnSTAT register is "1").
Chapter 10 Watchdog Timer
See Section 10.1.1 "Features".
[ ] WDT is the function used to monitor the CPU runaway. Its function as an ordinary timer is not
guaranteed.
[ ] The watchdog timer is unable to detect all the abnormal operations. Even if the CPU loses control, the
watchdog timer is unable to detect the abnormality in the operation state in which the WDT counter is
cleared. It is recommended that the WDT counter is cleared at one place in the main loop of the program
as a fail-safe.
[ ] WDT can be operated based on the clock independent of the system clock by using RC1K oscillation
for the WDTCLK, resulting in further improvement of safety. However, it is recommended to choose
LSCLK if high accuracy of the frequency is required, since the RC1K oscillation is less accurate than the
LSCLK.
See Section 10.2.2 "Watchdog timer control register (WDTCON)".
[ ] In the WDT interrupt routine (when the interrupt level (ELEVEL) of the CPU program status word
(PSW) is "2"), the WDT counter is unable to get cleared.
See Section 10.2.3 "Watchdog Timer Mode Register (WDTMOD)".
[ ] The overflow period set in WDT2 to WDT0 bits is the time when the WDTCLK is 1.024 kHz. If RC1K
oscillation is chosen for the WDTCLK clock, the frequency has a significant error.
[ ] If window function enabled mode 1 or window function enabled mode 2 is chosen, no WDT interrupt is
generated. A reset is generated in the first overflow.
[ ] The WDTMOD register is cleared through hardware resets such as the power-on reset.
See Section 10.2.4 "Watchdog Timer Counter Register (WDTMC)".
[ ] The count value read from the WDT counter are discontinuous due to the hardware structure.
See Section 10.3.1 "How to Clear WDT Counter ".
[ ] Maximum of two clocks of WDTCLK are required during the period between writing "0x5A", "0xA5" to
the WDTCON register and clearing of the WDT counter. To enter the STOP mode or STOP-D mode
following WDT clearing, do so after making sure that the WDTCLR1 bit became "0". In addition, if
changing the WDTMOD register setting, write to the WDTMOD register after confirming that both of
WDTCLR1 and WDTCLR2 bits became "0" as soon as the WDT counter was cleared.
[ ] In the STOP/STOP-D mode, the WDT timer is stopped.
See Section 10.3.3 "Window Function Enabled Mode".
[ ] When using the window function enabled mode, always define a WDT interrupt function even though
no WDT interrupt occurs. For providing the fail-safe, it is recommended to generate the WDT invalid
clear reset by forcibly clearing the WDT in the WDT interrupt function.
[ ] When using the window function enabled mode, choose "the clock with divided frequency of low-speed
oscillation clock (32.768 kHz)" for the WDT count clock with the code option. If "WDT RC1K oscillation
clock" is chosen, this function is unavailable to use because the frequency has a significant error.
[ ] In the watchdog timer (WDT) interrupt function, as the interrupt level (ELEVEL) of the CPU program
status word (PSW) becomes "2", the WDT counter is unable to get cleared. Clear the WDT when the
ELEVEL is "0" or "1". It is recommended that the WDT counter is cleared at one place in the main loop
of the program as a fail-safe.
Содержание ML62Q1000 Series
Страница 17: ...Chapter 1 Overview...
Страница 112: ...Chapter 2 CPU and Memory Space...
Страница 154: ...Chapter 3 Reset Function...
Страница 166: ...Chapter 4 Power Management...
Страница 196: ...Chapter 5 Interrupts...
Страница 248: ...Chapter 6 Clock generation Circuit...
Страница 274: ...Chapter 7 Low Speed Time Base Counter...
Страница 291: ...Chapter 8 16 Bit Timer...
Страница 320: ...Chapter 9 Functional Timer FTM...
Страница 382: ...Chapter 10 Watchdog Timer...
Страница 402: ...Chapter 11 Serial Communication Unit...
Страница 456: ...Chapter 12 I2 C Bus Unit...
Страница 491: ...Chapter 13 I2 C Master...
Страница 512: ...Chapter 14 DMA Controller...
Страница 531: ...Chapter 15 Buzzer...
Страница 550: ...Chapter 16 Simplified RTC...
Страница 559: ...Chapter 17 GPIO...
Страница 594: ...Chapter 18 External Interrupt Function...
Страница 612: ...Chapter 19 CRC Generator...
Страница 632: ...Chapter 20 Analog Comparator...
Страница 644: ...Chapter 21 D A Converter...
Страница 655: ...Chapter 22 Voltage Level Supervisor...
Страница 676: ...Chapter 23 Successive Approximation Type A D Converter...
Страница 709: ...Chapter 24 Regulator...
Страница 714: ...Chapter 25 Flash Memory...
Страница 743: ...Chapter 26 Code Option...
Страница 750: ...Chapter 27 LCD Driver...
Страница 788: ...Chapter 28 On Chip Debug Function...
Страница 795: ...Chapter 29 Safety Function...
Страница 813: ...Appendix A...
Страница 881: ...Revision History...