User's Manual

Table Of Contents

TRF7970A

SLOS743K –AUGUST 2011–REVISED APRIL 2014

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6.14.3.2.3 TX Timer High Byte Control Register (0x04)

Table 6-31. TX Timer High Byte Control Register (0x04)

Function: For Timings

Default: 0xC2 at POR = H or EN = L, and at each write to ISO Control register

Bit Name Function Description

B7 tm_st1 Timer Start Condition 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

B6 tm_st0 Timer Start Condition

tm_st1 = 1, tm_st0 = 1 → end of RX SOF

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

6.14.3.2.4 TX Timer Low Byte Control Register (0x05)

Table 6-32. TX Timer Low Byte Control Register (0x05)

Function: For Timings

Default: 0x00 at POR = H or EN = L, and at each write to ISO Control register

Bit Name Function Description

B7 tm_length7 Timer Length MSB

B6 tm_length6 Timer Length

Defines the time when delayed transmission is started.

B5 tm_length5 Timer Length

RX wait range is 590 ns to 9.76 ms (1 to 16383)

B4 tm_length4 Timer Length

Step size is 590 ns

B3 tm_length3 Timer Length

All bits low = timer disabled (0x00)

B2 tm_length2 Timer Length

B1 tm_length1 Timer Length Preset 0x00 for all other protocols

B0 tm_length0 Timer Length LSB

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