htrc110 NXP Semiconductors, htrc110 Datasheet - Page 11

• Manufacturer Part Number: htrc110
• Description: Hitag Reader Chip
• Manufacturer: NXP Semiconductors

July 2006
HTRC110 Hitag Reader Chip
Rev. 3.0
9.
Commands
Table 1 depicts the HTRC110 command set summary.
Table 1: HTRC110 Commands
9.1. READ_TAG
This command is used to read the demodulated bit stream from a transponder: After the assertion of
the three command bits the HTRC110 instantaneously switches to READ_TAG-mode and transmits
the demodulated, filtered and digitized data from the transponder. Data comes out and should be
decoded by the microcontroller. READ_TAG-mode is terminated by a low to high transition at
SCLK.
Table 2: READ_TAG Command
9.2. WRITE_TAG_N
This command is used to write data to a transponder.
If N3-N0 are set to zero, the signal from DIN is transparently switched to the drivers. A high level
at DIN corresponds to antenna drivers witched off, a low level corresponds to antenna drivers
switched on.
If any binary number between 1 and 1111 is loaded into N3-N0 the drivers are switched off at the
next positive transition of DIN. This state is held for a time interval equal to N * T
(T
=8µs). This
0
0
method relaxes the timing resolution requirements to the microcontroller and to the software im-
plementation while providing exact, selectable write pulse timing. WRITE_TAG-mode is termi-
nated immediately by a low to high transition at SCLK.
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