HD6473887 Datasheet, PDF (272/523 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

Bits 7 and 6: Operating mode select 1 and 0 (SNC1, SNC0)
Bits 7 and 6 select the operating mode.
Bit 7
SNC1
Bit 6
SNC0
Description
0
0
8-bit synchronous mode
0
1
16-bit synchronous mode
1
0
Continuous clock output mode*¹
1
1
Reserved*²
Notes: 1. Use pins 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
0
1
Description
Tail mark is not output (synchronous mode)
Tail mark is output (SSB mode)
(initial value)
(initial value)
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
0
1
Description
HOLD TAIL is output
LATCH TAIL is output
(initial value)
Bit 3: Clock source select 3 (CKS3)
Bit 3 selects the clock source to be supplied and sets the SCK₁ pin to input or output mode.
Bit 3
CKS3
0
1
Description
Clock source is prescaler S, SCK₁ is output pin
Clock source is external clock, SCK₁ is input pin
(initial value)
255