STR720 datasheet(325/401 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

325 / 401 page

STR720 - EXTENDED FUNCTION TIMER (EFT)

325/401

Note

All formulas in this chapter assume that APB_CLK is the clock driving the EFT. If

External clock (FEXT) is selected, replace (FAPB / TPRESC) by FEXT., where TPRESC =

(CC7..CC0 + 1).

21.4 Register Description

Each Timer is associated with two control and one status registers, and with six pairs of data

registers (16-bit values) relating to the two input captures, the two output compares, the

counter. Every register can have only an access by 16 bits, that means is not possible to read

or write only a byte.

Input Capture A Register (ICAR)

Address Offset: 00h

Reset value: xxxxh

This is a 16-bit read only register that contains the counter value transferred by the Input

Capture A event.

Figure 55. Pulse Width Modulation Input Mode Timing

765432

MSB

LSB

rrrrrr

rrrrr

COUNTER 34E2

0000

0001

2ED0 2ED1 2ED2

34E2 0000

ICAPA

capture A

capture B

capture A

0002

PERIOD = ICAPA

PULSE LENGTH = ICAPB

Capture A,

period measurement,

reset counter

Interrupt

Capture B,

pulse width measurement

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