r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 1152

• Manufacturer Part Number: r5s77631ay266bgv
• Description: Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series
• Manufacturer: Renesas Electronics Corporation.

Section 27 Serial Communication Interface with FIFO (SCIF)
27.3.10 Transmit FIFO Data Count Register (SCTFDR)
SCTFDR is a 16-bit register that indicates the number of transmit data bytes stored in SCFTDR.
SCTFDR can always be read from the CPU.
27.3.11 Receive FIFO Data Count Register (SCRFDR)
SCRFDR is a 16-bit register that indicates the number of receive data bytes stored in SCFRDR.
SCRFDR can always be read from the CPU.
Rev. 1.00 Oct. 01, 2007 Page 1086 of 1956
REJ09B0256-0100
Initial value:
Initial value:
Bit
15 to 7
6 to 0
Bit
15 to 7
6 to 0
R/W:
R/W:
BIt:
BIt:
Bit Name
—
T6 to T0
Bit Name
—
R6 to R0
15
15


R
R
0
0
14
14


R
R
0
0
13
13


R
R
0
0
All 0
Initial
Value
All 0
Initial
Value
All 0
All 0
12
12


R
R
0
0
11

11

R
R
0
0
R/W
R
R
R/W
R
R
10
10


R
R
0
0
Description
Reserved
These bits are always read as 0. The write value should
always be 0.
These bits show the number of untransmitted data
bytes in SCFTDR. A value of H'0000 indicates that
there is no transmit data, and a value of H'0040
indicates that SCFTDR is full of transmit data.
Description
Reserved
These bits are always read as 0. The write value should
always be 0.
These bits show the number of receive data bytes in
SCFRDR. A value of H'0000 indicates that there is no
receive data, and a value of H'0040 indicates that
SCFRDR is full of receive data.


R
R
0
0
9
9


R
R
8
0
8
0


R
R
7
0
7
0
R6
T6
R
R
6
0
6
0
T5
R5
R
R
5
0
5
0
R4
T4
R
R
4
0
4
0
R3
T3
R
R
3
0
3
0
R2
T2
R
R
2
0
2
0
R1
T1
R
R
1
0
1
0
R0
T0
R
R
0
0
0
0