HBSTOP

          Bits 7-0 contain the stop and start positions,
          respectively, for programed horizontal blanking in
          280nS increments.Bits 10-8 provide a fine position
          control in 35nS increments.


+-------+----------+--------------+ | BIT# | FUNCTION | DESCRIPTION | +-------+----------+--------------+ | 15-11 | x | (unused) | | 10 | H1 | 140nS | | 09 | H1 | 70nS | | 08 | H0 | 35nS | | 07 | H10 | 35840nS | | 06 | H9 | 17920nS | | 05 | H8 | 8960nS | | 04 | H7 | 4480nS | | 03 | H6 | 2240nS | | 02 | H5 | 1120nS | | 01 | H4 | 560nS | | 00 | H3 | 280nS | +-------+----------+--------------+
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