Texas Instruments TRF7970A Manual page 61

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6.15.3.2.3 TX Timer High Byte Control Register (0x04)
Table 6-31 describes the TX Timer High Byte Control register.
Function: For Timings
Default: 0xC2 at POR = H or EN = L, and at each write to ISO Control register
Bit Name
B7 tm_st1 Timer Start Condition
B6 tm_st0 Timer Start Condition
B5 tm_lengthD Timer Length MSB
B4 tm_lengthC Timer Length
B3 tm_lengthB Timer Length
B2 tm_lengthA Timer Length
B1 tm_length9 Timer Length
B0 tm_length8 Timer Length LSB
6.15.3.2.4 TX Timer Low Byte Control Register (0x05)
Table 6-32 describes the TX Timer Low Byte Control register.
Function: For Timings
Default: 0x00 at POR = H or EN = L, and at each write to ISO Control register
Bit Name
B7 tm_length7 Timer Length MSB
B6 tm_length6 Timer Length
B5 tm_length5 Timer Length
B4 tm_length4 Timer Length
B3 tm_length3 Timer Length
B2 tm_length2 Timer Length
B1 tm_length1 Timer Length
B0 tm_length0 Timer Length LSB
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Table 6-31. TX Timer High Byte Control Register (0x04)
Function
tm_st1 = 0, tm_st0 = 0 → beginning of TX SOF
tm_st1 = 0, tm_st0 = 1 → end of TX SOF
tm_st1 = 1, tm_st0 = 0 → beginning of RX SOF
tm_st1 = 1, tm_st0 = 1 → end of RX SOF
Table 6-32. TX Timer Low Byte Control Register (0x05)
Function
Defines the time when delayed transmission is started.
RX wait range is 590 ns to 9.76 ms (1 to 16383)
Step size is 590 ns
All bits low = timer disabled (0x00)
Preset 0x00 for all other protocols
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SLOS743L – AUGUST 2011 – REVISED MARCH 2017
Description
Description
TRF7970A
TRF7970A
Detailed Description 61