ST7LITEU05 datasheet(56/115 Pages) STMICROELECTRONICS

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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 LTIC pin. When an input capture

occurs, the ICF bit is set and the LTICR register

contains the MSB of the free-running upcounter.

An interrupt is generated if the ICIE bit is set. The

ICF bit is cleared by reading the LTICR register.

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 36. Input Capture Timing Diagram

Mode

Description

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

0004h

13-bit COUNTER

0001h

fOSC

xxh

0002h

0003h

0005h

0006h

0007h

04h

LTIC PIN

ICF FLAG

LTICR REGISTER

CLEARED

125ns

(@ 8MHz fOSC)

fCPU

BY S/W

07h

READING

LTIC REGISTER

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