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参数资料
| 型号： | LC72707E |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 封装： | QFP-44 |
| 文件页数： | 5/15页 |
| 文件大小： | 159K |
| 代理商： | LC72707E |
Differences in Data Output between this IC and the LC72700E (Provided for reference purposes.)
The LC72700E provided all data that could be provided to the microcontroller in the later stages of the system, and was
designed so that the microcontroller was required to decide whether to accept or discard the data by checking the status
output. For example, a received data packet could be output as post-horizontal correction data and then again, a few
seconds later, could be output as post-vertical correction data. Data with no errors, or data that could be corrected by
horizontal correction was output twice as identical data. This IC implements the conditions shown on page 10 (in “Notes
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
only use 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.
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
No. 5970-13/15
LC72707E
METHOD
FRAME (Bit 0)
RTB (Bit 1)
VEC HALT (Bit 2)
A
H
L
No interleaves
A’
H
L
A + RTIB (*)
B
L
—
L
Interleaving
C
—
H
Block data only
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