Texas Instruments TRF7963A, Руководство пользователя

Страница: 47 / 73

47
TRF7963A
www.ti.com SLOS758G – DECEMBER 2011 – REVISED MARCH 2020
Submit Documentation Feedback
Product Folder Links: TRF7963A
Detailed Description
Copyright © 2011–2020, Texas Instruments Incorporated
6.14.1.2.5 RX Wait Time Register (0x08)
Table 6-23 describes the bit fields of the RX Wait Time register. This register defines the time after TX
EOF when the RX input is disregarded; for example, to block out electromagnetic disturbance generated
by the responding card.
Default Value: 0x1F, set at POR = H or EN = L and at each write to the ISO Control register
The RX wait time timer is controlled by the value in the RX Wait Time register. This timer defines the time
after the end of the transmit operation in which the receive decoders are not active (held in reset state).
This prevents incorrect detections resulting from transients following the transmit operation. The value of
the RX wait time register defines this time in increments of 9.44 µs. This register is preset at every write to
ISO Control register according to the minimum tag response time defined by each standard.
Table 6-23. RX Wait Time Register (0x08)
BIT NO. BIT NAME FUNCTION DESCRIPTION
B7 Rxw7
RX wait time. B7 is the
MSB.
Defines the time after the TX EOF during which the RX input is ignored.
Time starts from the end of TX EOF.
RX wait range is 9.44 µs to 2407 µs (1 to 255). Step size is: 9.44 µs.
The following default timings are preset by the ISO Control register (0x01):
9.44 µs for FeliCa
66 µs for ISO/IEC 14443 A and B
B6 Rxw6
B5 Rxw5
B4 Rxw4
B3 Rxw3
B2 Rxw2
B1 Rxw1
B1 Rxw0