ST7LITE39 datasheet(61/167 Pages) STMICROELECTRONICS

Il numero della parte	ST7LITE39

Spiegazioni elettronici	8-BIT MCU WITH SINGLE VOLTAGE FLASH, DATA EEPROM, ADC, TIMERS, SPI, LINSCI

PDF	167 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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ST7LITE3

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DUAL 12-BIT AUTORELOAD TIMER 3 (Cont’d)

11.2.3.3 Input Capture Mode

The 12-bit ATICR register is used to latch the val-

ue of the 12-bit free running upcounter CNTR1 af-

ter a rising or falling edge is detected on the ATIC

pin. When an input capture occurs, the ICF bit is

set and the ATICR register contains the value of

the free running upcounter. An IC interrupt is gen-

erated if the ICIE bit is set. The ICF bit is reset by

reading the ATICRH/ATICRL register when the

ICF bit is set. The ATICR is a read only register

and always contains the free running upcounter

value which corresponds to the most recent input

capture. Any further input capture is inhibited while

the ICF bit is set.

Figure 41. Block Diagram of Input Capture Mode

Figure 42. Input Capture timing diagram

ATCSR

CK0

CK1

ICIE

ICF

12-BIT AUTORELOAD REGISTER

12-BIT UPCOUNTER1

fCPU

ATIC

12-BIT INPUT CAPTURE REGISTER

IC INTERRUPT

REQUEST

ATR1

ATICR

CNTR1

(1 ms

fLTIMER

@ 8MHz)

timebase

OFF

COUNTER1

01h

fCOUNTER

xxh

02h

03h

04h

05h

06h

07h

04h

ATIC PIN

ICF FLAG

INTERRUPT

08h

09h

0Ah

INTERRUPT

ATICR READ

09h

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