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PCF1081AT Datasheet(PDF) 11 Page - List of Unclassifed Manufacturers |
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PCF1081AT Datasheet(HTML) 11 Page - List of Unclassifed Manufacturers |
11 / 19 page printed 1998 Apr 20 11 Philips Semiconductors Product Specification (Rev. 1998 Apr 20) Advanced Basestation IC PCF7991AT 9.3 WRITE_TAG This is the 3 bit short form of the command WRITE_TAG_N. It allows to switch into WRITE_TAG-mode with a minimum communication time. The behaviour of the WRITE_TAG command is identical to WRITE_TAG_N with two exceptions: WRITE_TAG-mode is entered after assertion of the 3rd command bit. No N parameter is specified with this command; instead the N value which has been programmed with the most recent WRITE_TAG_N command is used. If no WRITE_TAG_N was issued so far, a default N=0 (transparent mode) will be assumed. WRITE_TAG-mode is terminated immediately by a low to high transition at SCLK. As a result, the driver resume their initial state, regardless the actual state of the modulation pulse timer. Table 5 WRITE_TAG command sequence 9.4 READ_PHASE This command is used to read the antenna´s phase TANT, which is measured at every carrier cycle. The phase is coded binary in D5-D0. Table 6 READ_PHASE command sequence 9.5 SET_SAMPLING_TIME This command specifies the demodulator sampling time Ts. The sampling time is coded binary in D5-D0. Table 7 SET_SAMPLING_TIME command sequence BIT NO. 76543210 REMARK Command 1 1 0 −−−−− no response BIT NO. 76543210 REMARK Command 00001000 Response 0 0 D5 D4 D3 D2 D1 D0 BIT NO. 76543210 REMARK Command 1 0 D5 D4 D3 D2 D1 D0 no response |
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