
ML62Q1000 Series User's Manual
Chapter 3 Reset Function
FEUL62Q1000
3-11
3.3.4 Power-on Reset
The power-on reset occurs when detecting the start-up of the power (V
DD
), or when the power voltage (V
DD
) decreases
100 mV or more below the power-on reset trigger voltage (V
POR
) and after the power-on reset reaction time (T
POR
)
elapses. If the power-on reset occurs, the POR bit of the reset status register (RSTAT) is set to "1".
When the power voltage (V
DD
) reaches the power-on reset threshold voltage (V
POR
) or above, the reset is released and the
program begins to run.
See the data sheet of respective products for power-on reset specifications.
Figure 3-3 Power-on Reset Operation Waveforms
[Note]
Ÿ
Rise the V
DD
up to 1.8V or higher at the power up.
Ÿ
At the power-on, the reset is released when the power voltage (V
DD
) reaches the power-on reset
threshold voltage (V
POR
) or above. The CPU begins to run the program with low-speed clock (LSCLK) at
approximately 32.768kHz. If switching the CPU to a high-speed clock, start the voltage level supervisor
(VLS) function and perform one of the following processes:
-
Using the reset function of the VLS, retain the reset until the voltage reaches the level that enables
the high-speed clock operation.
-
Using the voltage detection function of the VLS, detect the voltage level that enables the high-speed
clock operation (1.8 V or higher).
See Chapter 22 "Voltage Level Supervisor (VLS)" for the voltage level supervisor function.
Ÿ
At the power-off, the reset occurs when the power voltage (V
DD
) decreases below the power-on reset
threshold voltage (V
POR
). In addition to that, bring the reset state using the voltage level supervisor (VLS)
before the voltage falls below the operating voltage limit described on the electrical characteristics in
the data sheet.
When resuming the operation, make sure that the voltage has been returned within the operating voltage
range.
V
DD
1.8V
0V
V
POR
T
POR
100mV
V
POR
Power-on reset
(reset at Low)
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...