參數(shù)資料
型號: ST72F60E1M1
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, PDSO24
封裝: 0.300 INCH, LEAD FREE, PLASTIC, SOP-24
文件頁數(shù): 88/139頁
文件大?。?/td> 1993K
代理商: ST72F60E1M1
Watchdog timer (WDG)
ST7260xx
52/139
External clock
The external clock (where available) is selected if CC0 = 1 and CC1 = 1 in the CR2 register.
The status of the EXEDG bit in the CR2 register determines the type of level transition on
the external clock pin EXTCLK that will trigger the free running counter.
The counter is synchronized with the falling edge of the internal CPU clock.
A minimum of four falling edges of the CPU clock must occur between two consecutive
active edges of the external clock; thus the external clock frequency must be less than a
quarter of the CPU clock frequency.
Figure 26.
Counter timing diagram, internal clock divided by 2
Figure 27.
Counter timing diagram, internal clock divided by 4
Figure 28.
Counter timing diagram, internal clock divided by 8
Note:
The MCU is in reset state when the internal reset signal is high, when it is low the MCU is
running.
CPU clock
FFFD FFFE FFFF 0000
0001
0002
0003
Internal reset
Timer clock
Counter register
Timer Overflow Flag (TOF)
FFFC
FFFD
0000
0001
CPU clock
Internal reset
Timer clock
Counter register
Timer Overflow Flag (TOF)
CPU clock
Internal reset
Timer clock
Counter register
Timer Overflow Flag (TOF)
FFFC
FFFD
0000
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相關(guān)代理商/技術(shù)參數(shù)
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