ST72321R9-Auto datasheet(104/243 Pages) STMICROELECTRONICS

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16-bit timer

ST72321xx-Auto

104/243

Doc ID 13829 Rev 1

The alternate inputs (ICAP1 and ICAP2) are always directly connected to the timer. So any

transitions on these pins activates the input capture function.

Moreover if one of the ICAPi pins is configured as an input and the second one as an output,

an interrupt can be generated if the user toggles the output pin and if the ICIE bit is set.

This can be avoided if the input capture function i is disabled by reading the ICiHR (see note

1).

The TOF bit can be used with interrupt generation in order to measure events that go

beyond the timer range (FFFFh).

Figure 46.

Input capture block diagram

Figure 47.

Input capture timing diagram

ICIE

CC0

CC1

16-BIT FREE RUNNING

COUNTER

IEDG1

(Control Register 1) CR1

(Control Register 2) CR2

ICF2

ICF1

(Status Register) SR

IEDG2

ICAP1

ICAP2

EDGE DETECT

CIRCUIT2

16-BIT

IC1R Register

IC2R Register

EDGE DETECT

CIRCUIT1

FF01

FF02

FF03

TIMER CLOCK

COUNTER REGISTER

ICAPi PIN

ICAPi FLAG

ICAPi REGISTER

Note: The

rising edge is the active edge.

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