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STR720 bảng dữ liệu(PDF) 312 Page - STMicroelectronics

tên linh kiện STR720
Giải thích chi tiết về linh kiện  ARM720T 16/32-BIT MCU WITH 16K RAM, USB, CAN, 3 TIMERS, ADC, 6 COMMUNICATIONS INTERFACES
PDF  401 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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STR720 bảng dữ liệu(HTML) 312 Page - STMicroelectronics

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STR720 - EXTENDED FUNCTION TIMER (EFT)
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21.3.2
External Clock
The external clock (where available) is selected if ECKEN = 1 in CR1 register.
The status of the EXEDG bit determines the type of level transition on the external clock pin
EXTCLK that will trigger the counter.
The counter is synchronized with the rising edge of the internal clock coming from the APB
block.
At least four rising edges of the APB_CLK must occur between two consecutive active edges
of the external clock; thus the external clock frequency must be less than a quarter of the APB
clock frequency.
Figure 44. Counter Timing Diagram, internal clock divided by 2
Figure 45. Counter Timing Diagram, internal clock divided by 4
APB_CLK
FFFD FFFE FFFF 0000
0001
0002
0003
INTERNAL RESET
TIMER STROBE:
COUNTER REGISTER
OVERFLOW FLAG TOF
FFFC
FFFD
0000
0001
APB_CLK
INTERNAL RESET
TIMER STROBE
COUNTER REGISTER
OVERFLOW FLAG TOF
1



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