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EM4350A5WW7 Datasheet(PDF) 8 Page - EM Microelectronic - MARIN SA |
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EM4350A5WW7 Datasheet(HTML) 8 Page - EM Microelectronic - MARIN SA |
8 / 14 page R EM4150 EM4350 Write Word (cont.) After reception of the command, the address, and the data, the EM4150 will check the parity, the write protection status, the Login status, and also if the available power from the RF field is sufficient. If all the conditions are satisfied, an acknowledge pattern (ACK) will be issued afterward and the EEPROM writing process will start. At the end of programming, the chip will send an Acknowledge pattern (ACK). If at least one of the checks fails, the chip will issue a no acknowledge pattern (NAK) instead of ACK and return to the Standard Read Mode. The Transceiver will keep the RF field permanently "ON" during the whole writing process time. The Read After Write function (bit 17 of Control word) controls the mode of operation following a write operation. When "ON" the latest written word will be read out and output next to the ACK pattern and two Listen Windows (LIW-LIW) even if the word is read protected. When "OFF", the ACK is followed immediately by a LIW-LIW and FWR. The last written word is not output. If a request from the transceiver to return in receive mode (RM) is generated during the LIW, another word can be written in. Otherwise, the EM4150 will return in the Standard Read Mode. OUTPUT WORD n LIW INPUT ACK RM WRITE WORD ADDRESS DATA ACK LIW OUTPUT WORD n LIW INPUT NAK RM WRITE WORD ADDRESS DATA LIW Write 1 word Write several words Read After Write function OUTPUT WORD n LIW INPUT ACK RM WRITE WORD ADDRESS DATA ACK LIW RM WRITE WORD ADDRESS DATA OUTPUT WORD n LIW INPUT ACK RM WRITE WORD ADDRESS DATA ACK Last Written LIW FWR LIW FWR LIW LIW FWR LIW Note: The Last Written is outpout even if Read Protected. TRANSCEIVER RF FIELD "ON" TRANSCEIVER RF FIELD "ON" TRANSCEIVER RF FIELD "ON" TRANSCEIVER RF FIELD "ON" LIW twa twee twa twee twa twee twa Fig. 17 Copyright © 2004, EM Microelectronic-Marin SA 8 www.emmicroelectronic.com |
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