參數(shù)資料
型號(hào): HMS30C7202N
廠商: Electronic Theatre Controls, Inc.
英文描述: Highly-intergrated MPU
中文描述: 高intergrated微處理器
文件頁(yè)數(shù): 147/179頁(yè)
文件大?。?/td> 2127K
代理商: HMS30C7202N
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HMS30C7202N
2004 MagnaChip Semiconductor Ltd. All Rights Reserved. Version 1.1
- 142 -
10.9
Watchdog Timer
The watchdog timer (WDT) has a one-channel for monitoring system operations. If a system becomes
uncontrolled and the timer counter overflows without being rewritten correctly by the CPU, a reset signal is
output to PMU
When this watchdog function is not needed, the WDT can be used as an interval timer. In the interval timer
operation, an interval timer interrupt is generated at each counter overflow.
FEATURES
z
Watchdog timer mode and interval timer mode
z
Interrupt signal INT_WDT to interrupt controller in the watchdog timer mode & interval timer mode
z
Output signal MNRESET to PMU (Power Management Unit)
z
Eight counter clock sources
z
Selection whether to reset the chip internally or not
z
Reset signal type: manual reset
10.9.1
Watchdog Timer Operation
10.9.1.1
The Watchdog Timer Mode
To use the WDT as a watchdog timer, set the MODESEL and TMEN bits of the WDTCTRL to 1. Software must
prevent WDTCNT overflow by rewriting the WDTCNT value (normally by writing 0x00) before overflow occurs.
If the WDTCNT fails to be rewritten and overflow due to a system crash or the like, INT_WDT signal and
PORESET/MNRESET signal are output. The INT_WDT signal is not output if INTREN is disabled (INTREN =
0).
WDTCNT
MODESEL = 1
time
Ox00
OxFF
0x00 written in
WDTCNT
WTOVF = 1
and
FAULT
internal
reset
TMEN = 1
Figure 10-7 WDT Operation in the Watchdog Timer mode
If the RSTEN bit in the WDTCTRL is set to 1, a signal to reset the chip will be generated internally when
WDTCNT overflows.
10.9.1.2
The Interval Timer Mode
To use the WDT as an interval timer, clear MODESEL in WDTCTRL to 0 and set TMEN to 1. A watchdog timer
interrupt (INT_WDT) is generated each time the timer counter overflows. This function can be used to
generate interval timer interrupts at regular intervals.
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