ST7LITE09 datasheet(49/122 Pages) STMICROELECTRONICS

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ST7LITE0, ST7SUPERLITE

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LITE TIMER (Cont’d)

Input Capture

The 8-bit input capture register is used to latch the

free-running upcounter after a rising or falling edge

is detected on the ICAP1 pin. When an input cap-

ture occurs, the ICF bit is set and the LTICR regis-

ter contains the MSB of the free-running up-

counter. An interrupt is generated if the ICIE bit is

set. The ICF bit is cleared by reading the LTICR

The LTICR is a read only register and always con-

tains the data from the last input capture. Input

capture is inhibited if the ICF bit is set.

11.1.4 Low Power Modes

11.1.5 Interrupts

Note: The TBF and ICF interrupt events are con-

nected to separate interrupt vectors (see Inter-

rupts chapter).

They generate an interrupt if the enable bit is set in

the LTCSR register and the interrupt mask in the

CC register is reset (RIM instruction).

Figure 32. Input Capture Timing Diagram.

Mode

Description

SLOW

No effect on Lite timer

(this peripheral is driven directly

by fOSC/32)

WAIT

No effect on Lite timer

ACTIVE-HALT No effect on Lite timer

HALT

Lite timer stops counting

Interrupt

Event

Flag

Enable

Control

Bit

Exit

from

Wait

Exit

from

Halt

Exit

from

Active-

Halt

Timebase

Event

TBF

TBIE

Yes

IC Event

ICF

ICIE

Yes

04h

8-bit COUNTER

01h

fOSC/32

xxh

02h

03h

05h

06h

07h

04h

LTIC PIN

ICF FLAG

LTICR REGISTER

CLEARED

4µs

(@ 8MHz fOSC)

fCPU

BY S/W

07h

READING

LTIC REGISTER

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