Renesas R5S72621 User Manual
Section 18 Serial Sound Interface
Page 914 of 2108
R01UH0134EJ0400 Rev. 4.00
Sep
24,
2014
SH7262 Group, SH7264 Group
18.3.6
FIFO Status Register (SSIFSR)
SSIFSR consists of status flags indicating the operating status of the transmit and receive FIFO
data register.
data register.
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Bit:
Initial value:
R/W:
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Bit:
Initial value:
R/W:
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R/(W)*
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R/(W)*
0
0
0
0
0
0
0
0
-
-
-
-
-
-
-
-
-
-
-
TDE
-
-
-
-
-
-
-
-
-
-
-
RDC[3:0]
TDC[3:0]
RDF
Bit Bit
Name
Initial
Value R/W Description
Value R/W Description
31 to 28
All
0
R
Reserved
These bits are always read as 0. The write value should
always be 0.
always be 0.
27 to 24 TDC[3:0]
0000
R
Number of Data Bytes Stored in SSIFTDR
TDC[3:0] = H'0 indicates no data for transmission.
TDC[3:0] = H'8 indicates that 32 bytes of data for
transmission is stored in SSIFTDR.
TDC[3:0] = H'8 indicates that 32 bytes of data for
transmission is stored in SSIFTDR.
23 to 17
All
0
R
Reserved
These bits are always read as 0. The write value should
always be 0.
always be 0.
16 TDE 1 R/(W)* Transmit Data Empty
Indicates that, when the FIFO is operating for
transmission, the data for transmission in the transmit
FIFO data register (SSIFTDR) is transferred to the
transmit data register (SSITDR), the number of data
bytes in the FIFO data register has become less than
the transmit trigger number specified by TTRG[1:0] in
the FIFO control register (SSIFCR), and thus writing of
data transmission to SSIFTDR has been enabled.
transmission, the data for transmission in the transmit
FIFO data register (SSIFTDR) is transferred to the
transmit data register (SSITDR), the number of data
bytes in the FIFO data register has become less than
the transmit trigger number specified by TTRG[1:0] in
the FIFO control register (SSIFCR), and thus writing of
data transmission to SSIFTDR has been enabled.