RM0319 datasheet(253/368 Pages) STMICROELECTRONICS

253 / 368 page

RM0319

Fast infrared port (IRDA)

Doc ID 022640 Rev 3

253/368

The occurrence of a frame invalid interrupt (FI_INT, Section 19.4) due to any reason during

the reception indicates that the received data has become invalid and then the buffer

content is cleared without sending further requests.

When the received frame has been completely read out of the buffer, the FIrDA controller

changes back to the listening stage.

19.4

Interrupts

Table 73 shows a summary of the interrupts of the FIrDA controller. A brief description of

each interrupt follows after the table.

Table 73.

FIrDA controller interrupt summary

Name

Description

FD_INT

Frame detected.

This type of interrupt indicates that a frame has been detected during the Reception

State (see Section 19.3.3).

FI_INT

Frame invalid.

When it occurs in reception state, it means that the currently received frame is

invalid. This can be due to a CRC error, the reception of an invalid flag (see

Section 19.3.3), a frame abort (see Section 19.3.1), the reception of an invalid

symbol (see Section 19.3.2), the reception of a too long frame or a FIFO overflow

(see Section 19.3.6), or an abort by software. In the interrupt service routine the

software should discard the bytes of the current frame, which have already been

transferred to the memory.

When it occurs in transmission state, it indicates that the current frame has not been

sent completely. This can be due to either a FIFO underflow (see Section 19.3.6), or

an abort by software.

Note: FD_INT must have a lower priority than FI_INT.

SD_INT

Signal detected.

This kind of interrupt indicates that a signal has been detected by the

Synchronization Unit during the Listening State (Section 19.3.1).

FT_INT

Frame transmitted.

This kind of interrupt occurs when a frame has been completely transmitted by the

Modulation Unit (see Section 19.3.4).

BREQ_INT

Burst request.

This interrupt occurs when a transfer of a programmed burst number of words

from/to the memory is requested. This request can either be used as interrupt or

DMA requests (see Section 19.3.6).

LBREQ_INT

Last burst request.

This interrupt indicates that a last burst transfer from/to the memory is requested.

This request can either be used as interrupt or DMA requests (see Section 19.3.6).

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