Texas Instruments TRF7960 Manual page 27

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Table 6-20 describes the RX Wait Time register. This register defines the time after TX EOF when the RX
input is disregarded. The default is 0x1F and is reset at POR = H or EN = L and at each write to the ISO
Control register.
BIT BIT NAME FUNCTION
B7 Rxw7
B6 Rxw6
B5 Rxw5
B4 Rxw4 RX wait
B3 Rxw3
B2 Rxw2
B1 Rxw1
Table 6-21 describes the Modulator and SYS_CLK Control register. This register controls the modulation
depth, modulation input, and ASK/OOK pin control. The default is 0x11 and is reset at POR = H or EN = L
and at each write to the ISO Control register, except for the Clo1 and Clo0 bits.
Table 6-21. Modulator and SYS_CLK Control Register (Address = 09h)
BIT BIT NAME FUNCTION
B7 Unused
1 = Enables external selection of ASK or OOK
B6 en_ook_p
modulation
B5 Clo1
SYS_CLK output frequency. MSB is B5.
B4 Clo0
1 = Enables analog output on the ASK/OOK pin
B3 en_ana
(pin 12)
B2 Pm2
B1 Pm1 Modulation depth. MSB is B2.
B0 Pm0
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Table 6-20. RX Wait Time Register (Address = 08h)
COMMENTS
Defines the time during which the RX input is ignored. Starts from the end of TX EOF.
RX wait range is 9.44 µs to 2407 µs (1 to 255), and step size is 9.44 µs.
Presets are:
293 µs for ISO/IEC 15693
66 µs for ISO/IEC 14443 A and B
180 µs for Tag-it
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COMMENTS
Valid only when ISO control register (0x01) is configured to direct
mode
Clo1 Clo0 SYS_CLK Output
0 0 Disabled
0 1 3.3 MHz
1 0 6.78 MHz
1 1 13.56 MHz
For test and measurement
Pm2 Pm1 Pm0
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
TRF7960 TRF7961
TRF7960, TRF7961
Modulation Type and Percentage
ASK 10%
OOK (100%)
ASK 7%
ASK 8.5%
ASK 13%
ASK 16%
ASK 22%
ASK 30%
Detailed Description 27