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參數(shù)資料
型號: L64781
廠商: LSI CORP
元件分類: 消費(fèi)家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝: PLASTIC, QFP-100
文件頁數(shù): 155/164頁
文件大小: 2003K
代理商: L64781
5-20
Registers
5.4.1 TPS Register Implementation
Internally, there are three separate TPS registers:
Active TPS register
Next TPS register
Received TPS register
The active TPS register contains the current mode of the DTTV
demodulator.
The next TPS register is written to by writing to the TPS register in the
register map. When the “change mode” command is issued, the next
TPS register is copied into the active TPS register, and this becomes the
current mode of the demodulator.
The received TPS register contains a copy of the last valid TPS received
in the input signal. This register is read by reading from the TPS register
in the register map. If the “automode enable” bit is set, then every time
a valid TPS is received and a super-frame boundary is detected, the
demodulator copies the contents of the received TPS register into the
active TPS register, changing the mode of the DTTV receiver if the
received TPS changes.
If the received TPS and the current mode of the DTTV demodulator
differ, the “TPS info change” bit is asserted HIGH for one CLK18 clock
cycle. When the “TPS info change” interrupt is enabled and this event
occurs, the DTTV demodulator generates an interrupt to the external
microcontroller.
The rule for the TPS information change applies to all TPS data bits
except the frame number, which is updated every frame. A detailed
implementation of the TPS registers appears in Figure 5.3.
l64781.book Page 20 Friday, January 19, 2001 1:28 PM
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