0x4A or 0x4B,
This will send data bits 6 down to 0 to the TMS/CS pin using the LSB or MSB and -ve or +ve TCK/SK, depending on which of the lower bits have been set.
0x4A : TMS/CS with LSB first on +ve TCK/SK edge - use if TCK/SK is set to '1'
0x4B : TMS/CS with LSB first on -ve TCK/SK edge - use if TCK/SK is set to '0'
Bit 7 of the Byte1 is passed on to TDI/DO before the first TCK/SK of TMS/CS and is held static for the duration of TMS/CS clocking. No read operation will take place.