ML620Q503/Q504 User’s Manual
Chapter 10 Watchdog Timer
FEUL620Q504 10–1
10 Watchdog Timer
10.1 Overview
Watchdog timer is free run counter that is used for detection of program abnormal behavior.
The watchdog timer start count automatically after system reset release and requests WDT interrupt when the first
overflow occurs.
When the second overflow occurs, the watchdog timer generates a WDT reset signal and shifts the mode to a system
reset mode.
For interrupts see Chapter 5, “Interrupts,” and for WDT interrupt see Chapter 3, “Reset Function”.
10.1.1 Features
•
Free running (stop setting in DEEP-HALT mode is available)
•
Count low-speed clock 128 period.
•
One of four types of overflow periods (125ms, 500ms, 2s, and 8s @LSCLK=32.768kHz) selectable by software
•
Requests a WDT interrupt (non-maskable interrupt) by the first overflow
•
Reset generated by the second overflow
10.1.2 Configuration
Figure 10-1 shows the configuration of the watchdog timer.
WDTCON
: Watchdog timer control register
WDTMOD
: Watchdog timer mode register
Figure 10-1 Configuration of Watchdog Timer
WDTCON
Data bus
WDP
D
Q
R
QN
“5AH”
detection
“0A5H”
detection
WDT counter
R
Reset interrupt
control
WDT reset
WDTINT
Non-maskable interrupt
RESET_N
System reset
T256HZ
WDTCON Write
WDT overflow
WDTMOD
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...