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參數(shù)資料
| 型號： | CR16MHS9VJEE |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 16位微控制器 |
| 英文描述： | Family of CompactRISC 16-Bit Microcontrollers |
| 中文描述： | 家庭CompactRISC 16位微控制器 |
| 文件頁數(shù)： | 45/99頁 |
| 文件大小： | 449K |
| 代理商： | CR16MHS9VJEE |
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13.5
WATCHDOG PROGRAMMING
PROCEDURE
The highest level of protection against software errors is
achieved by programming and then locking the WATCHDOG
registers and using the WDSDM register for servicing. This is
the procedure:
1. Write the desired values into the TWM Clock Prescaler
register (TWCP) and the TWM Timer 0 register
(TWMT0) to control the T0IN and T0OUT clock rates.
The frequency of T0IN can be programmed to any of six
frequencies ranging from 1/32*f
SLCLK
to f
SLCLK
(1.024
kHz to 32.768 kHz if SLCLK is 32.768 kHz). The fre-
quency of T0OUT is equal to the frequency of T0IN di-
vided by (1+PRESET), where PRESET is the value
written to the TWMT0 register.
2. Configure the WATCHDOG clock to use either T0IN or
T0OUT by setting or clearing the TWCFG.WDCT0I bit.
3. Write the initial value into the WDCNT register. This
starts operation of the WATCHDOG and specifies the
maximum allowed number of WATCHDOG clock cycles
between service operations.
4. Lock the WATCHDOG registers and enable the
WATCHDOG Service Data Match Enable function by
setting bits 0, 1, 2, 3, and 5 in the TWCFG register.
5. Service the WATCHDOG by periodically writing the val-
ue 5C hex to the WDSDM register at an appropriate
rate. Servicing must occur at least once per period pro-
grammed into the WDCNT register, but no more than
once in a single WATCHDOG input clock cycle.
相關PDF資料 |
PDF描述 |
|---|---|
| CR16MHS9VJEI | Family of CompactRISC 16-Bit Microcontrollers |
| CR16MNS5 | Family of CompactRISC 16-Bit Microcontrollers |
| CR16MNS544VC | Family of CompactRISC 16-Bit Microcontrollers |
| CR16MNS544VI | Family of CompactRISC 16-Bit Microcontrollers |
| CR16MNS9 | Family of CompactRISC 16-Bit Microcontrollers |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| CR16MHS9VJEI | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Family of CompactRISC 16-Bit Microcontrollers |
| CR16MNS5 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Family of CompactRISC 16-Bit Microcontrollers |
| CR16MNS544V8Y | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| CR16MNS544V9Y | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| CR16MNS544VC | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Family of CompactRISC 16-Bit Microcontrollers |
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