STR720 datasheet(313/401 Pages) STMICROELECTRONICS

部件名	STR720

功能描述	ARM720T 16/32-BIT MCU WITH 16K RAM, USB, CAN, 3 TIMERS, ADC, 6 COMMUNICATIONS INTERFACES

PDF	401 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

313 / 401 page

STR720 - EXTENDED FUNCTION TIMER (EFT)

313/401

According to particular device implementation, the external clock can be available on a

general purpose I/O pin as alternate function, this allows the Timer to count events

independently by the system clock (which could be prescaled or multiplied according to the

different run and low-power modes), generating regular time basis.

21.3.3

Input Capture

In this section, the index “i”, may be A or B.

The two input capture 16-bit registers (ICAR and ICBR) are used to latch the value of the

counter after a transition detected by the ICAPi pin (see Figure 47).

ICiR register are read-only registers.

The active transition is software programmable through the IEDGi bit of the Control Register

(CR1).

Timing resolution is one/two count of the counter: (fAPB/(CC7÷CC0+1)).

Figure 46. Counter Timing Diagram, internal clock divided by n

APB_CLK

INTERNAL RESET

TIMER STROBE

COUNTER REGISTER

OVERFLOW FLAG TOF

FFFC

FFFD

0000

STR720 数据表(PDF) 313 Page - STMicroelectronics