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STR720 bảng dữ liệu(PDF) 324 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
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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STR720 bảng dữ liệu(HTML) 324 Page - STMicroelectronics

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21.3.8
Pulse Width Modulation Input
The PWM Input functionality enables the measurement of the period and the pulse width of an
external waveform. The initial edge is programmable.
It uses the two Input Capture registers and the Input signal of the Input Capture A module.
21.3.8.1 Procedure
The CR2 register must be programmed as needed for Interrupts and DMAs. To use pulse
width modulation mode select the following in the CR1 register:
– set the PWMI bit
– Select the first edge in IEDGA
– Select the second edge IEDGB as the negated of IEDGA
– Program the clock source and prescaler as needed
– Enable the counter setting the EN bit.
To have a coherent measure the interrupt/DMA should be linked to the Input Capture A
Interrupt, reading in ICAR the period value and in ICBR the pulse width.
To obtain the time values:
Where:
fAPB
= APB clock frequency
tPRESC
= Timer clock prescaler: (CC7..CC0)+1
The Input Capture A event causes the counter to be initialized to 0000h, allowing a new
measure to start. The first Input Capture on ICAPA do not generate the corresponding
interrupt request.
Period =
ICAR * fAPB
tPRESC
Pulse =
ICBR * fAPB
tPRESC
1



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