ZHCS762F December 2011 – May 2017 TRF7963A
PRODUCTION DATA.
Table 6-21 describes the bit fields of the TX Pulse Length Control register. This register controls the length of TX pulse.
Default Value: 0x00, set at POR = H or EN = L and at each write to ISO Control register
The length of the modulation pulse is defined by the protocol selected in the ISO Control register (0x01). With a high-Q antenna, the modulation pulse is typically prolonged, and the tag detects a longer pulse than intended. For such cases, the modulation pulse length can be corrected by using the TX pulse length register 0x06. If the register contains all zeros, then the pulse length is governed by the protocol selection. If the register contains a value other than 0x00, the pulse length is equal to the value of the register in 73.7-ns increments. This means the range of adjustment can be 73.7 ns to 18.8 µs.
| BIT NO. | BIT NAME | FUNCTION | DESCRIPTION |
|---|---|---|---|
| B7 | Pul_p2 | Pulse length. B7 is the MSB. | The pulse range is 73.7 ns to 18.8 µs (1 to 255), step size 73.7 ns All bits low (00) = Pulse length control is disabled The following default timings are preset by the ISO Control register (0x01): |
| B6 | Pul_p1 | ||
| B5 | Pul_p0 | ||
| B4 | Pul_c4 | ||
| B3 | Pul_c3 | ||
| B2 | Pul_c2 | ||
| B1 | Pul_c1 | ||
| B0 | Pul_c0 |