STR720 datasheet(315/401 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

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315 / 401 page

STR720 - EXTENDED FUNCTION TIMER (EFT)

315/401

21.3.4

Output Compare

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

This function can be used to control an output waveform or indicating when a period of time

has elapsed.

When a match is found between the Output Compare register and the counter, the output

compare function:

– Assigns pins with a programmable value if the OCiE bit is set

– Sets a flag in the status register

– Generates an interrupt if enabled

Two 16-bit registers Output Compare Register A (OCAR) and Output Compare Register B

(OCBR) contain the value to be compared to the counter each timer clock cycle.

These registers are readable and writable and are not affected by the timer hardware. A reset

event changes the OCiR value to 8000h.

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

Figure 48. Input Capture Timing Diagram

FF01

FF02

FF03

APB_CLK

COUNTER REGISTER

ICAPi PIN

ICAPi FLAG

ICAPi REGISTER

Note: Active edge is rising edge.

Capture

Window

FF04

EXTCLK

STR720 数据表(PDF) 315 Page - STMicroelectronics