Renesas H8/3847R Series Hardware Manual page 376

Section 10 Serial Communication Interface
Bit 1: Tail mark transmission flag (MTRF)
When MRKON = 1, bit 1 indicates that a tail mark is being transmitted. MTRF is a read-only bit,
and cannot be modified.
Bit 1
MTRF Description
0 Idle state, or 8-bit/16-bit data transfer in progress
1 Tail mark transmission in progress
Bit 0: Start flag (STF)
The STF bit controls the start of transfer operations. SCI1 transfer operation is started when this
bit is set to 1.
STF remains set to 1 during transfer and while SCI1 is waiting for a start bit, and is cleared to 0
when transfer ends.
Bit 0
STF Description
0 Read
Write
1 Read
Write
3. Serial Data Register U (SDRU)
Bit 7
SDRU7
Initial value Undefined
Read/Write R/W
SDRU is an 8-bit read/write register used as the data register for the upper 8 bits in 16-bit transfer
(while SDRL is used for the lower 8 bits).
The data written into SDRU is output to SDRL in LSB-first order. In the replacement process, data
is input LSB-first from the SI
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REJ09B0145-0600
Transfer operation stopped
Invalid
Transfer operation in progress
Starts transfer operation
6 5
SDRU6 SDRU5
Undefined Undefined
R/W R/W
pin, and the data is shifted in the MSB → LSB direction.
1
4 3
SDRU4 SDRU3 SDRU2
Undefined Undefined Undefined
R/W R/W
(initial value)
(initial value)
2 1
SDRU1 SDRU0
Undefined Undefined
R/W R/W R/W
0