Hitachi H8/3937 Series Hardware Manual page 257

Bits 7 and 6: Operating mode select 1 and 0 (SNC1, SNC0)
Bits 7 and 6 select the operating mode.
Bit 7 Bit 6
SNC1 SNC0
0 0
0 1
1 0
1 1
Notes: 1. Use SI1 and SO1 as ports.
2. Do not set bits SNC1 and SNC0 to 11.
Bit 5: Tail mark control (MRKON)
Bit 5 controls tail mark output after transfer of 8-bit or 16-bit data.
Bit 5
MRKON Description
0 Tail mark is not output (synchronous mode)
1 Tail mark is output (SSB mode)*
Note: * SCI1 is an internal function that performs interfacing to the on-chip FLEX™ decoder. It
cannot be used with SSB mode selected.
Bit 4: LATCH TAIL select (LTCH)
Bit 4 selects whether LATCH TAIL or HOLD TAIL is output as the tail mark when MRKON = 1
(i.e. in SSB mode).
Bit 4
LTCH Description
0 HOLD TAIL is output
1 LATCH TAIL is output
Description
8-bit synchronous mode
16-bit synchronous mode
Continuous clock output mode*
2
Reserved*
1
(initial value)
(initial value)
(initial value)
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