
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)
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...