PCF7991AT 데이터 시트보기 (PDF) - Philips Electronics
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PCF7991AT Datasheet PDF : 19 Pages
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Philips Semiconductors
Advanced Basestation IC
Product Specification (Rev. 1998 Apr 20)
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
BIT NO.
Command
7
6
5
4
3
2
1
0
REMARK
1
1
0
−
−
−
−
− no response
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
BIT NO.
Command
Response
7
6
5
4
3
2
1
0
0
0
0
0
1
0
0
0
0
0
D5
D4
D3
D2
D1
D0
REMARK
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.
Command
7
6
5
4
3
2
1
0
REMARK
1
0
D5
D4
D3
D2
D1
D0 no response
printed 1998 Apr 20
11
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