on Post Error Correction Output Data”) concerning data with no errors. Stated simply, this IC does not output data

unnecessarily. For example, the INT signal will not be output for data from a received station that is not broadcasting

multiplexed data. Also, under good reception conditions where there are no errors, there will be no post-vertical

correction output and the INT signal period will be 18 ms.

There are cases where it may become impossible to acquire the data if the microcontroller software includes the data

acquisition conditions required for the LC72700E. For example, this problem may occur if the software was designed to

use only the post-vertical correction output. Since this IC does not output the same data twice and does not output bad

data at all, applications do not need to select from the input data if they simply acquire all data that starts at every INT

signal. (In other words, it can be also said that this IC does not generate any unnecessary interrupt signals.) To set up this

IC to provide the same output format as that of the LC72700E, applications must set bit 5 (INT MODE) in the control

register to 1. Note that this IC is added a control function that causes the IC not to output post-vertical correction data if

the vertical correction operation was not executed. Since this control function is not influenced by the INT MOVE flag,

post-vertical correction output is not provided during error-free reception even if the INT MOVE flag was set. Thus care

is required in application software design.

Methods for Supporting the Different Frame Formats

Applications can handle the A, A’, B, and C frame formats by setting bits 0 (FRAME), 1 (RTIB), and 2 (VEC HALT) in

the control register appropriately. The default values are appropriate for method B. Note that since the IC itself does not

provide any functions for recognizing the frame structure, applications must set these bits using the serial data transfer

function.

No. 5876-13/16

LC72709E, 72709W

While the VEC HALT flag allows method C to be handled, the information related to the block number and the

information related to frame synchronization in the status output will be invalid.

Invalid status:

CNT1: Bit 5 FIL

Frame synchronization information

CNT1: Bit 3 PRI

Parity packet information

CNT1: Bit 2 HEAD

Frame head information

CNT1: Bit 0 RTIB

RTIB information

CNT2:

Data block number and parity packet number information

(*) RTIB: Real Time Information Blocks

METHOD

FRAME (Bit 0)

RTB (Bit 1)

VEC HALT (Bit 2)

A

H

H

L

No interleaves

A’

H

L

L

A + RTIB (*)

B

L

—

L

Interleaving

C

—

—

H

Block data only