參數資料
型號： ST7FLU05MAE
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO8
封裝： 0.150 INCH, LEAD FREE, PLASTIC, SOP-8
文件頁數： 86/124頁
文件大?。?/td> 2186K
代理商： ST7FLU05MAE
Obsolete
Product(s)
- Obsolete
Product(s)
On-chip peripherals
ST7LUS5, ST7LU05, ST7LU09
64/124
Figure 29.
Lite timer block diagram
10.1.3
Functional description
The value of the 13-bit counter cannot be read or written by software. After an MCU reset, it starts
incrementing from 0 at a frequency of fOSC. A counter overflow event occurs when the counter rolls over
from 1F39h to 00h. If fOSC = 8 MHz, then the time period between two counter overflow events is 1ms.
This period can be doubled by setting the TB bit in the LTCSR register.
When the timer overflows, the TBF bit is set by hardware and an interrupt request is generated if the
TBIE is set. The TBF bit is cleared by software reading the LTCSR register.
Watchdog
The watchdog is enabled using the WDGE bit. The normal watchdog timeout is 2ms (@ fOSC = 8 MHz),
after which it then generates a reset.
To prevent this watchdog reset from occurring, software must set the WDGD bit. The WDGD bit is
cleared by hardware after tWDG. This means that software must write to the WDGD bit at regular intervals
to prevent a watchdog reset from occurring. Refer to Figure 38.
If the watchdog is not enabled immediately after reset, the first watchdog timeout will be shorter than
2ms, because this period is counted starting from reset. Moreover, if a 2ms period has already elapsed
after the last MCU reset, the watchdog reset will take place as soon as the WDGE bit is set. For these
reasons, it is recommended to enable the watchdog immediately after reset or else to set the WDGD bit
before the WGDE bit so a watchdog reset will not occur for at least 2ms.
LTCSR
Watchdog
13-bit upcounter
/2
8-bit
fLTIMER
fWDG
8 MSB
LTIC
fOSC
WDGD
WDGE
WDG
TBF
TBIE
TB
ICF
ICIE
Watchdog reset
LTTB interrupt request
LTIC interrupt request
LTICR
input capture
register
1
0
1 or 2 ms
Timebase
(@ 8 MHz
fOSC)
To 12-bit auto-reload tImer
fLTIMER
RF
0
7
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