// 8 bits per transfer, no loopback, MSB first, 1 transfer per sync
// pulse, no output sync, start on positive-going edge of sync
// 8 bits per transfer, no loopback, MSB first, 1 transfer per sync
// pulse, no output sync, start on positive-going edge of sync
// clock comes from TK pin, no clock output, outputs change on falling
// edge of TK, start on rising edge of TF
// clock comes from TK pin, no clock output, outputs change on falling
// edge of TK, start on rising edge of TF