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參數(shù)資料
| 型號(hào)： | ST6388 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 8-BIT MCUs WITH ON-SCREEN-DISPLAY FOR TV TUNING |
| 中文描述： | 8位微控制器對(duì)屏幕，電視調(diào)諧顯示器 |
| 文件頁數(shù)： | 22/82頁 |
| 文件大小： | 718K |
| 代理商： | ST6388 |
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ST6380, ST6381, ST6382, ST6383, ST6388, ST6389
3.4 HARDWARE ACTIVATED DIGITAL WATCHDOG FUNCTION
The hardware activated digital watchdog function
consists of a down counter that is automatically in-
itialized after reset so that this function does not
need to be activated by the user program. As the
watchdog function is always activated this down
counter can not be used as a timer. The watchdog
is using one data space register (HWDR location
D8h). The watchdog register is set to FEh on reset
and immediately starts to count down, requiring no
software start. Similarly the hardware activated
watchdog can not be stopped or delayed by soft-
ware.
The watchdog time can be programmed using the
6 MSBs in the watchdog register, this gives the
Figure 17. Hardware Activated Watchdog Block Diagram
possibility to generate a reset in a time between
3072 to 196608 oscillator cycles in 64 possible
steps. (With a clock frequency of 8MHz this means
from 384ms to 24.576ms). The reset is prevented
if the register is reloaded with the desired value
before bits 2-7 decrement from all zeros to all
ones.
The presence of the hardware watchdog deacti-
vates the STOP instruction and a WAIT instruction
is automatically executed instead of a STOP. Bit 1
of the watchdog register (set to one at reset) can
be used to generate a software reset if cleared to
zero).
Figure 17
shows the watchdog block dia-
gram while
Figure 18
shows its working principle.
RSFF
8
DATA BUS
VA00010
-2
-12
OSCILLATOR
CLOCK
RESET
WRITE
RESET
DB0
R
S
Q
DB1.7
SET
LOAD
7
8
-2
SET
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相關(guān)代理商/技術(shù)參數(shù) |
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| ST6388B1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCUs WITH ON-SCREEN-DISPLAY FOR TV TUNING |
| ST6388B4 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCUs WITH ON-SCREEN-DISPLAY FOR TV TUNING |
| ST6389 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCUs WITH ON-SCREEN-DISPLAY FOR TV TUNING |
| ST6389B1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCUs WITH ON-SCREEN-DISPLAY FOR TV TUNING |
| ST6389B4 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCUs WITH ON-SCREEN-DISPLAY FOR TV TUNING |
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