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TDA9951 Folha de dados(PDF) 7 Page - NXP Semiconductors |
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TDA9951 Folha de dados(HTML) 7 Page - NXP Semiconductors |
7 / 41 page TDA9951_1 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 01 — 7 August 2008 7 of 41 NXP Semiconductors TDA9951 CEC/I2C-bus translator 8.3 Using the INT line The TDA9951 is an I2C-bus slave device and when data is ready to be read, it uses the INT output line to signal the host processor. The common configuration register INT_POL bit sets the operating polarity of the INT line. When the INT line is active, it matches the state of the INT_POL bit. The INT line state is updated in the common status register making it possible to poll the register instead of monitoring the INT line. This method is less efficient consequently, it is not recommended. The common status register INT indication is not affected by the common configuration register INT_POL bit. 8.4 Register descriptions Table 6. APR - Address pointer register (address 00h) bit description Bit Symbol Access Value Description 7 to 5 reserved W 000 reserved 4 to 0 REG_PTR[4:0] W - address pointer: Address of the register to be read/written in the next I2C-bus communication. Table 7. CSR - Common status register (address 00h) bit description Bit Symbol Access Value Description 7 BUSY R 0 default; requests accepted 1 busy; cannot accept further requests 6 INT R 0 default; INT interrupt output is inactive 1 the INT interrupt output is active 5 ERR R 0 default; no error 1 an error occurred; cleared on reading the common error register 4 SBY R 0 default; the SBY (standby) output pin is inactive LOW 1 the SBY output pin is HIGH 3 PSEN 0 the PSEN input pin is LOW 1 the PSEN input pin is HIGH 2 to 0 000 not used (must be set to 000) Table 8. CER - Common error register (address 01h) bit description Bit Symbol Access Value Description 7 to 0 CER[7:0] R This register contains details of the last error. Reading this register resets the ERR bit in the common status register 00h no error has occurred since reset 01h a watchdog reset has occurred 02h a long CEC message with no End Of Message (EOM) was detected 03h CEC input has overrun. No buffer was available to hold new data |
Nº de peça semelhante - TDA9951 |
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Descrição semelhante - TDA9951 |
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